Our world is getting warmer. This we know. Just look at Los Angeles, which experienced all-time record heat in July, topping out at 118 degrees Fahrenheit. Dozens of other heat records across the United States were smashed this summer alone. But how much will temperatures in US cities change by 2050? By then, scientists say average global warming since preindustrial levels could be about twice what it is in 2018 — and much more obvious and disruptive. It’s a world you’ll (probably) be living in. And it’s the one we’re definitely handing off to the next generation. To answer this...