Most experts don't predict the collapse of industrialized society. Higher temperatures, rising sea levels, and more energetic weather events will cause damage and make life difficult for decent chunks of the population especially those in less developed areas that are both hotter and more poorly equipped to cope with climate change. But I'm not aware of a consensus or even a plurality among climate scientists that industrialized society is going to collapse even in the more pessimistic predictions.

I'm not sure how Cambridge, Massachusetts, where the company building these pig kidneys is located, becomes a hunter-gatherer society on account of climate change.