Troubling new research suggests global warming will cut wheat yields. 15 percent decline in wheat yields under a 2 degrees Celsius warming scenario, rising to around 40 percent with 4 degrees (C) of warming.
Observant aliens visiting Earth and studying its civilizations would probably be pretty obsessed with wheat. They couldn’t fail to note how staggeringly many people we feed with the crop on this planet.
The impact, though, will depend on the local climate, the availability of water, and the wheat variety itself.