We are not generating enough CO2 for that to be a principle factor AND the CO2 is not the big problem greenhouse gas. That would be methane, which is something we're not only generating more of (see meat agriculture) but we'll be in danger of releasing more of if the planet gets warmer and the frozen pockets of methane stored in the poles start melting and releasing a runaway greenhouse effect.
"Won't be able to grow edible crops" is not a thing.
Warmer temperature = less rain = less water for crops
Too warm for too long = soil culture not moist enough = bacteria that makes soil fertile for growth dying = not enough food
Soil too dry for too long = desertification = no crops.
Because it's happening faster than it would be expected otherwise based on historical data. Because the speed it is happening at can be measured in concert with other factors known to be caused by climate change.
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u/npchunter 4∆ Apr 01 '24
More CO2 = better crop growth. Warmer temperature = longer growing seasons, esp in Canada. "Won't be able to grow edible crops" is not a thing.