As the article notes, AC units can overcome that, but not everyone can afford that around the world. If they're poor, are they even people, though? /s
It also makes an interesting point about non-mechanised farming. It's still a big industry, but you can't really do it if it's too hot. I wonder if we might actually see an increase in mechanisation in the tropics as traditional farmers are forced to sell and move elsewhere. Man, spices are going to get so expensive :(