Because that's the one that actually can happen, unlike apocalyptic visions of "Earth burning", or "famine"

You think famines are unlikely? They've been the irregular default prior to the modern age; I think it will require active efforts to prevent them no matter what happens with the climate.

Climate change might actually increase amount of arable land, by millions of acres, in higher latitudes: Sweden, Finland, Greenland, Canada, etc. It will also increase total rainfall. https://phys.org/news/2018-05-climate-arable.html

Yes, it won't be seamless, but we can adjust to new conditions.