How will the effects of climate change impact politics in America over the next 25 years? Hotter summers might curb the trend of moving to the Southeast and the coasts, and Northern state populations could swell by 20 percent by 2035. And urban centers are likely to expand. "Taken together, these changes could disrupt political patterns that have taken hold over the last two decades. ... Shift electoral votes from the Sunshine State to the Great Lakes, or from California to the Dakotas, and you open up all sorts of new routes to the magic number, 270."