We should focus on the temperature rise of just above 7°F, because that is likely to be what we will see at the end of the century, without any additional climate policies beyond those to which governments have already committed. At 7.2°F in 2100, climate change would cause negative impacts equivalent to a 2.9 percent loss to global GDP. Remember, of course, that the world will be getting much richer over the course of the century. And that will still be true with climate change—we will still be much richer, but slightly less so than we would have been without global warming.
