As Carbon Dioxide Levels Rise, Major Crops Are Losing Nutrients
npr.org
npr.org
> Across the hall, we can see a possible glimpse of the plant's future. Here, there's a chamber with plants growing at CO2 levels projected for the end of this century.
> "Some of the varieties, you ought to see that they're bigger," says Ziska. They've all been growing for the same amount of time, but the high CO2 coffee plants are larger. The extra CO2 seems to be making them grow faster.
> Scientists have noticed that in many kinds of plants, higher CO2 produces bigger crops. That sounds like a good thing.
> But there's a problem. Bigger doesn't necessarily mean better. And while they're still testing what this means for coffee's quality, scientists have seen that other crops have lost some of their nutritional value under higher CO2 conditions.
If they are bigger they absorb (or have absorbed) more CO2 into their carbohydrates, I wonder what the effect is on CO2 levels in the atmosphere, is this taken into account in all the models? Moreover, how were the effects when compensated for the increased mass of the plant? Were there the same amount of nutrients but just more carbohydrates and water? If so, other ways of preparing the food may help.
Plants only absorb about 25% of atmospheric CO2, so if they are growing 10% larger, then that's only 2.5% more overall.
Were there the same amount of nutrients but just more carbohydrates and water? If so, other ways of preparing the food may help.
They mentioned this in the article:
However, Myers notes that if this were the cause, all of the nutrients would be decreasing at approximately the same rate. And that's not necessarily the case
It is in the relevant ones (having “all” in the question makes the question not meaningful).
Not only it is in the relevant models, but modelling all the effects includes the aspects that the most probably would never think about. E.g. “bigger crops” store C but it is “returned back” after harvesting. What matters is only what can permanently store C.
Yes it is, take a look here how complex it is:
https://www.earth-syst-sci-data.net/10/405/2018/essd-10-405-...
And it's not just "models" for the predictions, the data about what happens from day to day and from year to year are measured constantly, and all give the numbers that are very clear. CO2 in the atmosphere increases. And it won't be nice.
To quote one scientist that first didn't believe, but checked the data and now himself corrects the false claims by those who have some special agendas:
"Of the 7 GtC, which we blow into the atmosphere every year, only 3 remain there. 2 are absorbed by the ocean and 2 by the forests. This means that in the atmosphere and in the land biosphere and in the ocean the amount of stored carbon is increasing. And the source of all this additional carbon is the fact that we extract loads of fossil carbon from the earth's crust and add it to the system."
"The system was almost exactly in equilibrium before humans intervened. That is why the CO2 concentration in the air was almost constant for several thousand years."
Now it's not, even if the biosphere takes some of CO2 the we extract from the Earth's crust, still more remains up there and makes the Earth surface warmer.
We measure that year after year already.
Here you can find the graph of the measurements of CO2:
https://e360.yale.edu/features/how-the-world-passed-a-carbon...
Yes, there is more CO2 every year, yes, some CO2 remains in biosphere, but no, there's no balance.