During the last Ice Age, CO2 levels were near levels where plants could not grow
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Drama! No it was not anything like that - there were lush forests all over the world in the temperate and tropical zones of the time. Plants require 150ppm, but during the last glaciation it was about 180-200ppm - fine for plant growth. Now we are approaching 400ppm up from 280ppm in the 1800s
“The spraying of high altitude aerosols” ah yes “chemtrails” of course, right, and so forth
“but somehow they think that reflecting light back into space will make the planet cooler.”
That’s actually partially true - light=heat. All cities are environmentally deserts radiating light and heat back into the Atmosphere, not space. But has no effect on overall planetary temperature, just on various authorities quotient of hubris.
AT 150 PPM, plant growth is sparse to non-existent. AT 180 we were close to a tipping point was my point.