evidence: Enough turbines to generate all of America’s power would warm the U.S. by 0.24 degrees Celsius Giant wind turbines that generate fossil fuel–free power add a little heat of their own to the planet. If the United States sprouted enough wind turbines to meet its entire demand for electricity, the turbines would immediately raise the region’s surface air temperatures by 0.24 degrees Celsius, on average, scientists report online October 4 in Joule. In the short term, that’s not a negligible amount: Current global greenhouse gas emissions are projected to warm the contiguous United States by 0.24 degrees Celsius by 2030.