These changes won’t happen literally, of course—but that doesn’t make them any less real. A new paper tries to find the climate-change twin city for hundreds of places across the United States: the city whose modern-day weather gives the best clue to what conditions will feel like in 2080. It finds that the effects of global warming will be like relocating American cities more than 500 miles away from their current location, on average, mostly to the south and toward the country’s interior.
For instance, the Philadelphia of the 2080s will resemble the historical climate of Memphis. By the time kids today near retirement age, Philadelphia’s average summer will be about 7 degrees Fahrenheit warmer than it is now. Winters in Philly will be nearly 10 degrees more temperate. Memphis’s scorching, sticky weather provides the best guide to how those climatic changes will feel day after day.