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Thousands of Los Angeles homes and businesses l this weekend after blistering heat caused temperatures to climb into the triple digits, taxing an already strained electrical grid as residents cranked up their AC.

In addition to power outages, heat waves are, taking more lives on average than hurricanes, floods, and tornados. Meteorologists define the heat index, or danger days, as heat and humidity combining to create real feel temperatures above 105 掳F or 40掳C.

U.S. cities are expected to experience more danger days in the coming years as extreme weather becomes the norm due to increased levels of carbon dioxide.