Modelling concluded that *a total of 7.4 million lives around the world will be saved over this century if the US manages to cut its emissions to net zero by 2050.*

This model considers only death caused directly by heat. Including fires, floods, heating-strengthened hurricanes, heating-spread diseases and climate-caused wars, I expect it to be hundreds of times that — but estimating that number is difficult.

The model also estimates saving $3.7tn in costs to adapt to the rising heat. A way to understand that is around 70 billion per year over 50 years.