I will have to look up the reference (don’t have time this evening and I’m away from my home library where I think I put my finger on it- will IM later).
In regards to increased levels of photosyntheis via agriculture- I would be hesitant to agree. Acres in crops has declined with increased productivity per acre due to fertilization and modern methods. Also, deforestation is not always, and maybe even seldom, linked to agriculture. Devlepoment and logging may take a big chunk.
Also, I think I remember your comment concerning plankton related photosyntheis being true, or consistent with your comment. However, with increased CO2 production through industrial release, there is no mechanism that increases plankton production for balance.
Wrong. Dead wrong.
Worse: The worst deforested areas are those LEAST able to get coal or oil burning energy. IF we could generate heat and power for these people - which their rulers refuse too permit, and which the enviro's cannot let start - THEN we would see deforestation for firewood eliminated.
Current levels of CO2 have INCREASED production of ALL plant matter and forests - the AVERAGE increase in production of food and fodder and woodlands is 17% - with most crops growing more than 12-27% MORE productively than at lower CO2 levels. Plus, HIGHER CO2 levels let crops tolerate MORE heat - though now we may be approaching a cold spell.
Let us hope it is “only” the usual few hundred years, not a full-scale Ice Age.
You are aware that CO2 is plant-food, yes? More CO2 means more plankton and generally more rapidly growing plant life. This is pretty well documented each generally, and in detail. Also, look at the difference between C3 and C4 photosynthesis in plants...some types of plants have mechanisms for survival in the relatively sub-optimal CO2 levels currently existing. Optimum for many plants is around 4000ppm, and long-term levels below 180ppm is fatal for those without the pumping and storage mechanisms.
You might also find the daily CO2 variance in areas with lush plant life interesting. I've previously posted graphs from a metering station in Luxembourg (it was the one I found) which has levels varying between 200ppm in late day, up to nearly 500 ppm just before sunrise.