Extreme heat, driven by climate change, is setting records across the globe. Combinations of high heat and humidity in the American South and Southwest continued this week and was expected to move north and east into the eastern U.S. and High Plains where they could be exacerbated by elevated humidity caused by corn crops. The combination of heat and humidity drove heat indexes well into triple digits, making it “really dangerous to spend any time outdoors in, unless you’re standing under a cool waterfall somewhere,” Greg Carbin, the chief of the forecast operations branch at the National Oceanic and Atmospheric Administration’s Weather Prediction Center, told the Times. The extreme heat is especially dangerous for U.S. Postal Service workers, which has failed to take adequate steps to protect mail carriers in dangerous temperatures after multiple hyperthermia deaths, according to Huffington Post reporting. Climate change is also fueling the Siberian heatwave that has pushed temperatures there over 100 degrees. A study released Wednesday by a team of international scientists found climate change made the region’s prolonged heatwave 600-times more likely, and would have been “effectively impossible without human influence,” lead author Andrew Ciavarella, a scientist at the UK Met Office told the AP. (U.S. Heat: New York Times $, E&E $; Postal Workers: HuffPo; Siberia: AP, New York Times $, The Guardian)