In his forthcoming book, Our Final Warning, Mark Lynas explains what is likely to happen to our food supply with every extra degree of global heating. He finds that extreme danger kicks in somewhere between 3C and 4C above pre-industrial levels. At this point, a series of interlocking impacts threatens to send food production into a death spiral. Outdoor temperatures become too high for humans to tolerate, making subsistence farming impossible across Africa and South Asia. Livestock die from heat stress. Temperatures start to exceed the lethal thresholds for crop plants across much of the world,
Hmm. August average high temp in Edinburgh is 3 degrees less than that in Brighton.
Wheat grows in both places, doesn’t it?