Basically, photosynthesis doesn't work good above 40C. Plants stop making sugars and start consuming them instead. This is unfortunate for us, because agricu

Basically, photosynthesis doesn't work good above 40C. Plants stop making sugars and start consuming them instead. This is unfortunate for us, because agriculture is basically the art of convincing plants to store as many extra calories as possible. So there's a major difference between "warm" and "hot" climates.