CO2 is garbage, not “plant food”.
It is recycled by photosynthesis using renewable solar energy.
From Eli. And it’s something with which I heartily agree! Plants do not `eat food`. If they did, they wouldn’t be plants. Moreover, any experiment where plants are exposed to an enriched CO2 atmosphere in the absence of sunlight (or equivalent light) produces nothing. See below the figure for references on what happens to vegetation in an atmosphere with increased or variable CO2 concentrations. Note that elevated Oxygen levels can also be toxic, not only for plants.
- N. Devaraju, L. Cao, G. Bala, K. Caldeira, and R. Nemani, “A model investigation of vegetation-atmosphere interactions on a millennial timescale“, Biogeosciences, 2011, 8, 3677-3686.
- S. L. Thompson, B. Govindasamy, A. Mirin, K. Caldeira, C. Delire, J. Milovich, M. Wickett, D. Erickson, “Quantifying the effects of CO2-fertilized vegetation on future global climate and carbon dynamics“, Geophysical Research Letters, 2004, , 31(L23211).