YOU’VE JUST EXPLORED THREE POSSIBLE versions of the year 2033: Trash becomes illegal, virtually overnight—and garbage removal as we know it is officially over. The richest countries on earth embark on a ten-year project to carefully, thoughtfully, and equitably move one billion people across borders to climate-safer homes. A global vote approves an

No one can say exactly how hot the world can get before out-and-out disaster—the inundation of a populous country like Bangladesh, say, or the collapse of crucial ecosystems like coral reefs—becomes inevitable. Officially, the threshold of catastrophe is an average global temperature rise of 2°C (3.6°F). Virtually every nation signed on to this fig

There is little consensus about the ways that climate change might manifest itself other than through temperature increases and probably rising sea levels.