It was December 1984, and President Reagan had just been elected to his second term, Dynasty was the top show on TV and Madonna’s Like a Virgin topped the musical charts. It was also the last time the Earth had a cooler-than-average month. Last month marked the planet’s 400th consecutive month with above-average temperatures, federal scientists from the National Oceanic and Atmospheric Administration announced Thursday. The cause for the streak? Unquestionably, it’s climate change, caused by humanity’s burning of fossil fuels.