I don’t like guessing. Whenever possible, I don’t. So I don’t look at many climate forecasts, but instead turn to weather data. Not current or future weather data—past data. The weather record is based on hundreds of thousands of reporting locations the world over, taken dozens of times a day, stretching back well over a century. The data isn’t controversial. It isn’t political. It isn’t a projection. And if there is a trend line of change, you know that the needle has moved already, and you just need to follow it forward a bit.