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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.

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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.

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