July wasn’t just hot — it was the hottest month ever recorded, according to NASA. And this year is likely to be the hottest year on record.

Fourteen of the 15 hottest years have occurred since 2000, as heat waves have become more frequent, more intense and longer lasting. A study in the journal Nature Climate Change last year found that three of every four daily heat extremes can be tied to global warming.

This map provides a glimpse of our future if nothing is done to slow climate change. By the end of the century, the number of 100-degree days will skyrocket, making working or playing outdoors unbearable, and sometimes deadly. The effects on our health, air quality, food and water supplies will get only worse if we don’t drastically cut greenhouse gas emissions right away.