A Saharah like climate won't feed 7.5 billion people. If the population crashes to a few million stragglers living mostly at the poles then we'll regress back to the stone age.
There may be no way yet to support 7,5 billion people on renewable energy. Then what?
Also not saying everything will become like the Saharah. Just that humans may adapt better than those animals who died in mass extinction events in the past.
Also not saying everything will become like the Saharah. Just that humans may adapt better than those animals who died in mass extinction events in the past.