yeah, you're reading that right. plants prettymuch stop being able to photosynthesize at around Fahrenheit 100.

and that's a graph from a study titled "
When can we expect extremely high surface temperatures?" predicting the rise of extreme temperatures worldwide.
see the bit where the midwest gets hot enough to kill crops more and more often, hotter and hotter, starting like... pretty damn soon?
after the recent heatwaves across the US, supposedly less than half of US corn is judged to be in "good" condition by the USDA and 22% is considered "bad", when just months ago, with record planting, the USDA predicted a
record crop this year. The price of corn has risen 30% since June, after the same record temperatures hammered farms in South America.
At least, assuming
this well-written and highly-recommended article is right. sounds pretty damn dire.