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This is neat! For your "SkyRoads" idea, as an alternative to satellite imagery (which I imagine is quite expensive for high resolution), have you considered partnering with the municipalities who are your customers to outfit their snowplows or garbage trucks with sensors to evaluate the road surface conditions? Since snowplows and garbage trucks have to regularly transit pretty much every public road in many parts of the world, it could be a great way to collect data over time. Plus, if you can make an app for hardware these vehicles already carry (or which can easily and cheaply be added to the vehicles) this might also appeal to your municipal customers even if they don't buy your road resurfacing product/service/etc.

I noticed after purchase my new car warns me of uneven road surfaces looming ahead. As far as I know, it does this by crowd-sourcing from other vehicle owners that have opted into allowing their vehicles to collect this information and send it back to the automaker, which then distributes it to all the other cars. Given this could potentially use every vehicle on the road for data collection instead of just plows and garbage trucks, I'd say the better approach would be for governments to compel automakers to share the road condition data they collect, not necessarily with other automakers, but at least with the governments that have to maintain the roads.

That's interesting! I fear the privacy crowd wouldn't be huge fans of this idea, so doing it just on municipal vehicles might be easier as a first step. But definitely, collecting data from things which are already driving around in general is a great idea!

Thanks both for very good ideas! We haven’t explored these ideas yet, but definitely interesting thoughts to consider as we build Sky Roads!

Very cool project!

In the attached video, was that crushing only or was lignin binder being mixed in as well? The output looks dark but kind of powdery, I would guess that's soil being mixed in, because I don't see a fluid tank on the back of that tractor.

It looks like resulting the particle size is quite small - I would assume that some amount of aggregate would be tolerable or even beneficial for material strength. Are there gravel sized bits under the top surface? Is the output uniform or are there distinct layers.

How long does the resulting road need to "set" before cars can start driving on it, and how does that compare to traditional techniques?

Demo video shows a ~2m wide output, is this system capable of making multilane roads yet?

Wish you the best, very clever idea. :D

Thank You! You are right! The video shows the first step, which is the crushing. Lignin mixing is step 2. The road can be used by cars immideatly after compacting, as with other methods. However, if You want asphalt on top, it is necessary to let it dry for 2-3 weeks to let the water-solved Lignin harden and dry. In the video it was already a lot of small particles in the ground. We can make rocks smaller, but not bigger:-) The sizes of the gravel bits are evenly distributed, but with some fines on the top(due to Newton). We are using 2,5 meters crushers. That makes it possible to not stop the traffic while working.

Do your estimates include the carbon cost of of the lingen transportation network needed to bring the lingen from where it's generated to where the road repair is being performed? What does that aspect of the cost look like and how does it compare with existing resource networks for traditional road repair?

What is the cost comparison per foot of road between traditional road repair and your approach (factoring in the maintenance interval increase)? Are there any regulatory challenges you've discovered that might be roadblocks to you scaling out? For example, Google Fiber had pole access issues due to regulations passed to benefit existing ISPs. Is there anything like this in this space?

Are there any niches where you see particular traction as being easier? You've got a big opportunity you're going after so I'm curious about where you're starting. For example, maybe you're especially attractive in adverse environments like snow + mountains. Or maybe cost-conscious towns where you can easily partner with local road repair crews and there aren't meaningful revenues for larger established players. Not actually sure, just curious where your land & expand strategy starts.

Thanks for digging into this, awesome questions!

Transport is included in all of our estimates, but we haven't yet done the comparison for every location in the world. We are working on a tool so we can on the fly update the CO2 calculation for each customer based on the location in our next markets which are North America and Southern Europe. That said, traditional road repair uses bitumen from oil production, or fly ash from coal power plant, which would also have to be transported from their respective source, and both oil, coal plant and lignin plants can be found around the world. Our current producer has great coverage in Europe and also in North America, and we are constantly looking at growing our supplier network. We are also focused on transport by electric trains in the Nordics and have also ordered Tesla Semis that can help us move binders and equipment.

We are 20% cheaper than the traditional method, factoring in the maintenance interval (we have a few years longer interval). This is with a solid gross margin, so we could also go lower to increase demand when needed.

We see a lot of interest from Eastern Europe (Poland + Baltics) and also from gravel roads around the world where we have an even stronger USPs to the customers. In maintaining gravel roads - the only alternative to our method is to put more gravel on every other year, which is expensive, time consuming, and leaves a terrible Co2 footprint compared to our long lasting roads.

Yeah I guess my implicit question there was the relative weights and density of the material needed to be transported per mile of road.

I’m sure your analysis is much more accurate than my native questions since you actually spent time in this space whereas I’ve spent none. Is there a paper you can share? I’d love to forward it to my friends in the space to bring you to their attention as doing cool stuff.

Hello

I watched your video with the Crusher. For most places having a subgrade of rock or good granular material as seen in the video would be a luxury for road construction. In general roads on this material are fairly stable and it is the more common subgrades of clay, silts and sands that have problems normally related to drainage issues. Does your solution offer anything for these scenariosm?

Thanks for diving into this! Yes, our Crusher, method and the Lignin binds sand and silts in a great way. If there is a lot of clay, we would also like to add some lime to help with the internal moist, here we have several carbon neutral solutions. Our finished road is more waterproof (compared to a gravel road without Lignin f.ex) and our roads helps a lot with the draining of water from the road. However, as on every road, the shape of the road is important so the water finds the shortest way out of the road, and the ditches should be maintained as for any other road.

I love to see creative approaches like this! A couple of naive questions:

1. How long will the carbon remain bound / out of the atmosphere?

2. How quickly can you scale, and what are the limiting factors that (if eased) would allow you to scale faster? (Hiring, refining the tech, refining the business proposition, finding customers, building hardware, ...)

1. Great question! Different academic experts claim lignin would be very stable in roads and stay there for a long time, and that when some degradation eventually happens, it will sequester downwards and become part of the soil. Deepdive: We have made roads 14 years ago which are still stable and in good quality today, indicating there hasn't been much degradation of the lignin to speak of. Adding here also a quote from an academic paper: “... the end-product of lignin decomposition in nature contains partially decomposed, fragmented lignin (humus) that enters the soil cycle, and remains in this layer for many years. Release of H2O and CO2 as decomposition products in this layer is extremely limited. Soil bacteria, microfauna, and even physical processes may play important roles in the final breakdown of humus. This is a slow process and some lignin degradation products have soil residence times of centuries (Ziekus, 1981).” - So, while we don't have the complete answer to speed of degradation yet (workin on it!), it seems it would stay beneath the ground far more than long enough to help our planet.

Where is the road made 14 years ago? Does lignin resist fungus/bacteria in a hot humid place like Brazil?

"Great question, we would love to crush carbon in South America! Our 14 year old road is in Heart Valley in Norway. All of our experience is from Norway so far and our current binder works well in similiar climates around the globe. So places like Brazil we will need to do testing to find the best binder for those environments. We are already in talks with Brazilian ligning producers btw. Our goal is to have a sustainable binder tailor made for all environments

2. With the Crushers we have today, we can reduce 25.000 tonnes this year, but we could in theory make 10x more Crushers for next year taking us to 250.000 tonnes next year. The demand is definetely there, scaling the sales & operation is the thing we work hard on. That's also why we are working on launching our crushing as a service model which will ease both operations and logistics globally. Refining and building hardware is not a limiting factor per se.

How are you saying this is carbon negative? Don't get me wrong the process is impressive and very cool, but the marketing around it just feels scammy.

-5kg of carbon per m2? How? The lignin based binder absorbs more carbon from the air after it is placed into the road? I may be misreading but it seems like these numbers are based on the amount of carbon in the lignin itself (i.e. since it isn't burned which would be positive, you can count it as negative as it is not burned)

If I am wrong on this, please correct me. But it sure sounds like a lot of conveniently vague statements to make for nice sounding numbers. This would be a shame as even without misleading claims of CO2 reduction, the benefit of removing oil from the process and replacing it with a renewable source is clear and should stand for itself.

If the binder does indeed absorb C02 over time what is the rate? What effect does it have on the binders stability? Or if its used in its manufacturing how are you sourcing the CO2? What is the breakdown timeframe for the binder releasing any sequestered carbon back into the atmosphere?

OP says the lignin is "a waste product from the paper industry" and "majority of lignin is burnt". So it sounds like: currently, grow tree (pulling carbon from the atmosphere), process for paper industry, burn the resulting lignin, carbon returns to atmosphere. With this process: grow tree, process for paper industry, embed lignin in road material. If the lignin remains in the road more-or-less permanently (I asked about this in a separate comment), that sounds like legit removal; the carbon started out in the air and ends up in the road.

Yes exactly, that's how we think about it. We are using nature's own capture machine, trees... thanks for this clear explanation :)

Except the current use of the byproduct is not just flaring it off pointlessly as waste. The byproduct is being burned as a fuel, which in that usage is already (nearly) neutral. If an alternative fuel has to be used instead, that fuel is more than likely going to be natural gas or coal.

This is how we lose the war against global warming. The process here is simple: 1. Tree captures carbon 2. Carbon gets buried in a road.

Simple.

For warming we can use electricity generated by wind, solar, tides etc.

Do not move the goalposts.

3. Carbon in lignon road is released as it decays over time.

Do you have a source that the binder is currently being used as a fuel source? I'm missing where that's implied by the OP.

It's correct that lignin is used as a fuel, here's one source of it. ~98 is burnt. "currently most of the lignin produced from paper industry is burned as low-value fuel to generate electricity and heat (Luo and Abu-Omar, 2017) and only less than 2% is used for producing specialty chemicals ..." https://www.sciencedirect.com/science/article/abs/pii/S09266...

I wonder what makes it a low value fuel. If it has a lot of carbon per energy released, it may be better to bury it than burn it.

Maybe the concern others are expressing here can be thought of as the risk of double counting of carbon.

If I run an industrial plant that's currently fuelled by burning waste lignin from the paper industry, and I decide to stop that and install some solar panels instead, it seems reasonable for me to claim that change is carbon negative (i.e. I've reduced carbon emissions).

Now if CarbonCrusher comes along and buys the lignin I no longer need, uses it to build a road, and claims the same carbon saving as I did, we end up double counting.

Which of us is wrong?

You're switching contexts.

When you switched from burning lignin to solar, you reduced your carbon usage.

However, what happened to the lignin that you stopped using?

If it was burned somewhere else, the total carbon usage remained the same even though you changed your usage.

If it was stockpiled and is now decomposing over three years, the carbon usage was time-shifted and will be back where it was in three years. (However, total carbon usage will be reduced the first and second year.)

This is supposedly a usage of lignin that results in no release, so it actually is carbon-negative (assuming that the processing doesn't use more carbon), regardless of what other folks think that they did. That said, it's probably actually just time-shifted, albeit on a long time-scale.

Note that both coal and diamonds are actually time-shifted carbon usage, on the scale of millions of years.

This is exactly my point (the after 3 years if it decomposed you are just time shifting) which is why I asked how long the roads take to decompose and what they translate into. Sooner or later that lignon in the road will become C02. But is that in 10 years? 100? If its time shifting it only by 15 years or so then its NOT reducing the total carbon to the atmosphere, just temporarily storing it. No different than putting the lignin in a warehouse for 15 years before burning it. So to call that carbon negative is just... bad math at best.

> When you switched from burning lignin to solar, you reduced your carbon usage. However, what happened to the lignin that you stopped using?

In my scenario, CarbonCruncher bought the lignin I stopped using and made a road out of it. Crucially, in doing so they claim to have a negative carbon impact because they'd trapped that carbon in the ground. But I already claimed that impact when I stopped buying and burning it myself and switched to a zero-emission energy source.

So my (genuine) question remains: we can't _both_ claim the benefit, so who's right?

What's the relevance of "claim"?

Thousands of people get "best grandma" coffee mugs each year. Logically, only one of them actually is, but who cares and why?

This is a very fair question. We need to be mindful going forward in how we communicate. We can say that our Scope 3 emissions are negative, but scope 1 we are slightly positive (but still much lower than competition) Just to clarify; we go from 7-10kg CO2 positive for traditional methods, to 5 kg negative in two steps; Step one is we reduce emissions from transport, extraction etc because we have a better Crusher which recycles the road better, which takes us to just above 1kg pr m2 - massive savings already from the traditional method, and this could be counted mostly in Scope 1 or 2, some of it in 3 (reduced extraction). The remaining ca -6 kg is the effect of lignin - here debated in the thread and that we are saying is carbon negative. This is a scope 3 effect.

Thanks for pointing out! We are still a young company and need to work on our Scope 1-3 accounting :)

Thanks a lot for adding these details about scoping[0]. I’ve definitely learned something there.

So my scope 1 emissions can be your scope 3 emissions if I emit carbon to make something that I sell to you… but the “real” emissions are always _somebody’s_ scope 1. Interesting stuff!

[0]: https://www.carbontrust.com/resources/briefing-what-are-scop...

Why is lignin burnt today?

Its a complex highly aromatic (in the chemistry sense) large molecule that there is active research in trying to convert to useful chemical products.

However it's quite difficult to break its bonds in ways that yield useful compounds. And until there is a viable way of upcycling it, burning it for energy is what they do

My problem is that a) the lignin will decay into C02 (what is the time frame on this? if its hundreds of years then maybe there is some merit here) but b) this implies that if a paper mill wanted to claim to be "carbon negative" they could simply build a warehouse and store lignin for a while before burning it. Furthermore, it implies that if I wanted to claim to be 1 million kgs carbon negative I can simply make a threat of starting a forest fire. If I then DON'T burn the forest I now can say I personally removed 1 million kgs of C02 from the atmosphere.

Yes - time and degradation is key. All evidence we have as of today suggests close to none degradation of the lignin, and if/when eventually some degradation happens (yet to happen on the roads we have from 14y back), sequestration downwards in the soil, from the deep stabilized road layer we have bound with lignin. This is a very important area for us to pioneer research on going forward to get completely right, thanks for all the comments here, it will help us sharpen our efforts.

Adding this one, we are spending a lot of time getting all the calculations on sequestrations right, here is some deeper information on this. https://carbonplan.org/research/ton-year-explainer

Great thread, thanks all for the passion for this important topic. Just to clarify; we go from 7-10kg CO2 positive for traditional methods, to 5 kg negative pr m2 in two steps; Step one is we reduce emissions from value chain; incl. transport, & extraction when our Crusher recycles the road, which takes us to just above 1kg pr m2 (massive savings already from the traditional method). The remaining ca -6 kg is the effect of lignin - turning the calculation towards negative - and here debated in the thread with different opinions.

> -5kg of carbon per m2? How? The lignin based binder absorbs more carbon from the air after it is placed into the road? I may be misreading but it seems like these numbers are based on the amount of carbon in the lignin itself (i.e. since it isn't burned which would be positive, you can count it as negative as it is not burned)

Replace the lignin with some fantastical material that contains no carbon and requires no carbon to produce, and after it is laid on the road it quickly absorbs CO2 from the atmosphere equivalent to the amount of carbon that lignin contains.

Would you say that is carbon negative?

Nope.

Nor is buying a bunch of stuff at the store that you don’t need just because it’s 35% off retail price “saving money”.

Cash flow positive is not losing money slower, it’s making more than you spend. Carbon negative absorbs more carbon than you spend. Including in chopping up an old road and recycling it, which is going to take a lot of power.

If I had a box that you plugged in that was actually carbon negative and I forgot I left it running while I was on vacation, I would not feel guilty. If doing nothing results in less carbon emissions than doing something, it’s not negative.

You don't think something that reduces net carbon in the atmosphere is carbon negative, then you're just making up your own definitions of things. Why waste everyone else's time? Seems like a hell of way to go about life.

No, you’re making up things. You think you’re asking if we think a net negative is a net negative, but that’s not what you asked. Not even close.

Making something takes energy, as you will recall if you weren’t asleep that entire semester in physics class. If the bit at the end cancels out some of the problems created earlier, you still have some of the problems created earlier.

No that's just your reading comprehension problem.

You're having a petri dish problem. Taken out of an environment, a lot of experiments and math look very good. It's interesting, might even be new knowledge, but it's not applicable.

That giant machine in their PR materials didn't just appear out of nowhere. It doesn't run on rainbows. It has a considerable embodied carbon footprint. It has an operational footprint, and a transportation footprint. It assuredly produces lots of pm2.5 and not just from the tailpipe.

Undoubtedly less that the process it replaces, but negative is an extraordinary claim, and I don't see any extraordinary evidence here.

You're shifting the goal posts because you badly misunderstood my initial post.

Projecting. This is projecting.

My goal post is us not choking on our own filth. We are in a closed system. Any bullshit that moves pollution around in time or location doesn’t fix anything, and because of the laws of thermodynamics there are only very narrow envelopes where doing something is globally better than doing nothing. Cooling a house heats the planet more than the house cools.

We can’t be celebrating systems that don’t move us toward 50% of our current budget. And some solutions that move you a quarter of the way there but then get you stuck at that point are a form of bargaining. In the end you have to let those go and he longer you delude yourself the worse things are.

We need less driving and fewer roads. Fuel efficiency and road efficiency actually increase demand. We’ve seen this, it is known.

This was my first reaction as well. I think the subtext is that the byproduct is currently being burned as a fuel source, which is common for things like sawdust in mills. So there's one aspect of this calculation that could be waaay off. If the mills that would have burned this byproduct in a boiler are selling it instead, they'll need another energy source for their boilers! If that energy source is a fossil fuel instead of a wood byproduct, then this "upcycling" has inadvertently become carbon positive (or perhaps neutral at best). And it will be a lot easier to retrofit an industrial boiler for natural gas than to convert it to electric. Even if it were electric, most of the world does not remotely have as clean a grid as Norway's. So it would be some decades before any carbon advantage emerges.

"Even if it were electric, most of the world does not remotely have as clean a grid as Norway's. So it would be some decades before any carbon advantage emerges."

So.... you give up? This is stupid all-or-nothing absolutist thinking. I'm not saying OP YC is the greatest thing since sliced bread, but long-term sequestration of tree carbon is a carbon sink.

Solar/Wind is at LCOE parity with natural gas turbine. It will pass it soon, with basic subsidies (as if fossil fuels aren't subsidized) then storage won't be a disadvantage either. If not, emerging economies of scale and tech progress in wind/solar will leave natural gas in the dust.

So even if the grid is dirty now, there is a clear path forward, and the grid will adapt to the changing pattern, and we already have the delivery method solved (the grid). And there are opportunities to possibly scrub carbon from central generation. Not as much as the sociopathic petroleum companies would like you to think so they can go business as usual, but better than an ICE car.

We don't think we are the greatest thing since sliced bread either! But thanks for the encouragement and good points, we try and hope we can point the carbon needle a meaningful push the right way with the means at our disposal - and this we will keep on doing, now fed with more inputs & insight

Taken to the other extreme, as the value of sawdust goes up the incentive to reduce sawdust goes down, decreasing the number of board feet per tree, increasing trees cut for lumber.

If you find a better use for sawdust, great. But if you could invent a new saw blade with a smaller kerf, you’d be helping more.

Thanks for the comment. See calculation breakdown added in a few threads above. Some of our thoughts about the carbon negative part:

Paper mills captures CO2 from trees (that are sustainably harvested, more trees planted than harvested p.a.) of which parts of it is released after some of the lignin is burned (inefficiently) for fuel. If they stop burning lignin for fuel, they need other energy sources, and then the question is how the paper mill chooses to do this: - The mills can choose to burn fossil fuels, get a renewable source, or buy electricity from the grid. We will only source lignin from players serious about sustainability and green alternatives (industrial broilers could also use green hydrogen), alongside prioritising maximised energy efficient operations - Even if they get electricity from the grid, the world is moving forward and we’re luckily reaching a point where additional capacity in the grid is coming from renewables, while fossil is decreasing - boosting new renewable buildout more

What’s very important in what you point out is that when we expand our lignin supplier base, we need to be careful in selecting our suppliers, understanding their alternatives and understanding our Scope 3 emission effects to ensure it aligns with our mission of saving the planet :) And that's what we will do - ensure that this ends up on the right side.

I agree. Stop using empty marketing words like "carbon negative". Your product seems good enough that you don't need to resort to this.

I'm sure there's a definition out there of carbon negative that means what you say it means, but if we're being honest carbon negative means that doing more of something reduces the amount of carbon in the atmosphere. You can't claim that not burning lignin is carbon negative since this product already exists as a byproduct in the paper industry (as you said). By repairing roads you're still emitting more carbon than removing from the atmosphere.

I don't agree with you.

If the product of the whole operation ends up with less carbon in the atmosphere, then it is in fact removing carbon. Plus they aren't using binders that contribute to more carbon to the atmosphere.

Now, we can be extremely strict in this definition and unless a company actually produces 0 carbon and is still extracting it from the atmosphere would be the ones who could claim they are "carbon negative", but then I guess not even CO2 extractors could claim that because they still need to be built and consume power.

I don't think that will get us anywhere. By that logic not even trees are "carbon negative".

In the end it's a matter of perspective, because what we're actually doing most of the time is offsetting/moving carbon around, and there's nothing wrong with that.

If it's captured from the air by a chemical process, or stored underground, or if it simply is stored in a byproduct that's reused and never reaches the atmosphere, it's all the same.

There is essentially no way this operation ends up with less carbon in the atmosphere.

It is very hard to do anything with biomass at industrial scale without emitting more carbon than the biomass itself contains.

Even look at biomass to energy, by the time harvest, transport, and process a tree for use to "offset" fossil fuel combustion, it's hard to say thats carbon negative.

Now you harvest the biomass, put it through some chemical engineering process to make a binder product, put this binder product in the hopper of some massive diesel powered behemoth machine that chews up, binds, and compacts and remakes roads. This obviously consumes a LOT of energy.

Is it a cool company? Yes, making effective nontoxic product out of another industries byproduct, to be used in something thats been foundational to human society for 1000s of years, roads, is maybe the neatest new company I've heard about in a long time.

Does it emit less carbon than some other ways of repaving roads? probably.

Is it carbon negative by ANY definition? OBVIOUSLY not (or I will eat my hat and throw an egg on my face.)

I'm honestly confused why there's ANY claim of being carbon negative, let alone it being front and center, when the underlying product can totally stand on its own??

> -5kg of carbon per m2

That machine that chews up the road and lays it back down, how many kg of carbon per m2 does it burn?

I think too you have to compare the lifetime pollution of a bitumen patch versus the point source pollution of grinding a road up in the open air and putting it back down. There's going to be a ratio of resurface vs patch that has a lower cost than using either strategy exclusively. Especially if you use their chemistry for patches, instead of resurfacing.

How do you propose to deal with fungi/ bacteria which have no issue digesting lignin?

Likewise, what would your source of lignin material? How do the transportation and processing costs impact your ability to generate the parent materials for this process?

290 million years ago, Agaricomycetes fungi evolved the ability to breakdown lignin. That is the only time any species evolved this ability.

And most rot is actually around the lignin. Amazing material.

thanks, great fungi question thread! It's true fungi can digest lignin. Based on our experience and tests done on our roads by the Norwegian Road Authority, our roads have very long durability, most of the time longer than expected from normal roads, so it seems that fungi hasn't been a problem on our roads so far. The lignin is mixed in and stored underground (spread in the 10 inches layer) and some of it will degrade over time and become part of the soil environment. We will need to test other binder formulas more extensively in warmer areas with more fungi, and create a portfolio of binders suitable for all environments :)

We are working working with some awesome scientists at https://www.nmbu.no/en and we will dig deeper into global fungi tactics together with them

That's for sure not going to work in rainforest environments, temperate (the PNW) or tropical, though it might work in drier or hotter climates.

Your success will depend on some claims you are making. I really hope you are just brief here, and have it amply written up elsewhere with real data. It always a major let-down when I meet with the inventors/idea folks and I find out there is a lot of hand-waving about claims, facts, and data.

Good luck!

Thanks for the comment and totally agree! We've worked through our calculations with one of the leading lignin producers globally and other experts. We either have or are working on third party validation for all of our data to make sure we also can provide high quality carbon credits.

What does the paper industry do with lignin now?

What happens to the lignin when cars drive along it?

Does any of it end up as airborne particulates?

What about the run-off after rains?

How is it in cold climates where they put salt on the roads?

Super fascinating.

Short hand product notes: Lower carbon impact, lower cost. What is the product life compared to incumbents?

From a user implementation perspective (IE the city crew): - Do they need new training, new equipment etc, how long compared to traditional implementation? - Is it easy to import to North America? - What are the adoption risks?

Look forward to seeing this in the wild! Interesting that you are going for a subscription model.

Yes indeed, thanks for the great short hand product notes! Lower carbon impact + lower cost + 0-25% more durable

We can supply the crusher hardware, our binders, onsite first time PM + remote PMs after that. We now do this in all of Europe, UK + North America. Imports are not an issue to North America and Carbon Crusher is an American company and we already have presence in the state of New York. There is no adoption risks as we see it, as long as the training is done properly.

The training is mainly operating training combined with daily and monthly maintenance. We have an extensive library of remote content for training purposes. Typical onsite training is 2 weeks, if the personell has experience with road maintenance. We are also looking at VR training to speed things up on the remote training side:)

How well does this handle several freeze-thaw cycles per year?

The carbon aspect is great, but I love how this attempts to address the unstable ground problem. Here in Quebec due to cheaply made road foundation and harsh freeze-thaw cycles, at this time of the year the roads have almost more potholes than... road.

Thank you for this Question! In Norway, where we have stabilized more than 2,5 mill sqm of road, this is the problem we solve the most. Our Lignin is very strong, and more dynamic than our competitors binders, which means it doesn't crack in freeze-thaw cycles like other binders can. And as we crush rocks and get an even mass to mix the lignin into, we get a very good road to handle such cycles. And the pothole-problems almost don't exist.

Some squares here now have a floor made of pebbles mixed with some kind of (epoxi?) resine instead of a floor made of concrete or just soil. Do you think that it's possible to use lignin as the glue instead?

Is the mix with lignin waterproof?

Thanks for the question! I do not believe that Lignin is the right "glue" in this case. It is quite water resistant, but to bind properly, it needs a certain amount of finer particles in the mix. If You choose gravel instead of pebbles, it should on the other hand work fine.

Congrats on the launch. As a side note, I love this landing page

Thanks, excited that you like it!

Some feedback on your “news” page. Near the bottom there is a section that says: “Are you ready to start with Vega template?”. Probably just an artifact and an easy fix.

Thanks for spotting this! we have now updated our website:)

Many congrats on the launch.

Further, we are working on new complementary road tech that can enhance and add to the carbon potential from our solution. This includes ... capturing and dissemination of energy captured by the roads.

I'm very interested in this part. Do you have any more details to share?

Very cool stuff. How far are you along with "SkyRoads"? Monitoring roads with the spatial resolution you would need sounds quite expensive. Though if it is for quotes on a per-request biases or once a year it might be more suitable.

Thanks a lot! We are in closed beta mode right now. Yes you are on point here. As premium surveillance feature will add this to the cost per m2 / mile road, the monthly price will depend on the number of pictures for our customer and it will cost extra for e.g. hyperspectral satellite images. For per-request quotes we are trying to find a suitable way to make it work so we can cover the cost. All thoughts / inputs appreciated :)

Awesome, impactful concept, this can be huge! Now comes the challenge of scaling

Thanks! We are hard at work at our hyper scale mode these days and looking for team members that can help us on the road to carbon negativeness.

This sounds like an incredible project -- and very much needed. Road building is such a huge source of emissions.

What are the biggest objections that your customers tend to have?

How much is the use of lignin a factor, in terms of long-term scaling?

Thanks! We are very excited turning roads into a part of the climate solution. Road construction and refurbishment is a very conservative industry and unfortunately they often want to stick to the way they've done things before. But we're working on disrupting this leveraging YC, cool green climate tech and documentation from our long track record!

There are huge amounts of lignin in the world which is the base for our current binder. With our current producer volumes and without leveraging synthetic bio we can reach USD 2bn in yearly global revenue. If we were to leverage all the current lignin supply in the world we could Carbon Crush 1.5million miles of roads every year.

One of the stats is your website says "27m sq. ft. roads stabilized". What does 27m mean here? Is it 27 million? I first read it as 27 meters square feet, which is confusing.

Keep crushing it!

You're going to get a lot of flak (and deservedly so) for the copy 'carbon negative roads'. Sure your process is less carbon intensive than traditional methods of making roads, but repaving roads directly enables a significant source of carbon emission, which dwarfs the carbon emissions of constructing the road itself. The optics aren't good.

Figure out how to mix red dye in with your binder and pave a bike lane.

> We’re three climate vikings

You had me here! <3

Yes! We are the nice vikings, crushing carbon every day! :-)

I love this idea. I really hope your technology is more widely adopted.

Thanks a lot! So do we :)

This is really cool, congrats and good luck!

Thanks a lot for that! :)

Tangential question: Has there been a discussion already on why HN participants cant invest in such YC startups?

There's no restrictions on investing in YC startups if you participate on HN.

And we have emails and other contact options on our website if you would like to reach out, https://www.carboncrusher.io/

> We are Re-inventing roads to solve global problems. At Carbon Crusher, we are committed to help solve climate change, making a positive impact on our planet.

> Our proprietary built Crusher

Why is "proprietary" important ?

Good question! First I think Haakon thinks it sounds A LOT cooler. Second, we have been R&D our asses off developing the actual Crusher hardware. The current Crusher we have developed over the last years is specifically designed for crushing in harsh environments and tailored for binding ligning into the roads. It is produced, tested over years and works perfectly for our purpose now. It is part of our IP and helps us make carbon negative roads that are more durable and cost less for our road owning customers. Can´t wait to share details about our next gen crusher thats coming later this years that will crush the current one especially on the software/sensor side

It's a keyword that attract investors.

Launch HN: Carbon Crusher (YC W22) – Carbon Negative Roads