The things we live on, the macronutrients.
They are:
Carbon
Nitrogen
Phosphorous
Oxygen
The rest is child's play. Some sulfur, some metals ... notably iron, and little trace bits of other things.
But is is all about moving the big 4.
Life builds them up into complex things, life tares them down into inorganic minerals ... CO2, water, N2, inorganic phosphate.
They are built up because the sun beats down upon us.
Life, as we know it, is propogated by cells under the direction of DNA/RNA.
The backbone of the helix is a phosphodiester ... phosphate-oxygen-phosphate-oxygen.
So we need phosphate, the stuff of rocks, and we need oxygen to build this thing.
The rungs of the ladder are sugars, carbon and oxygen. We build proteins, Carbon, Oxygen, and Nitrogen ... with a bit of sulfur on occasion. These work with a few metals (iron) to help us move electrons.
We know all of these things.
We are observing an excess of carbon in the atmosphere. The matter is a trivial one. And carbon is good stuff. We are fortunate to have so much. Indeed, what we have is a case of supply side economics gone mad. We simply need to improve the demand for carbon.
IN the end, as always, you are correct, it is about demand, in this case, carbon demand.
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