The United Nations’ climate panel warns in a new report that humanity has only a dozen years to mitigate climate change or face global catastrophe—with severe droughts, floods, sea level rise and extreme heat set to cause mass displacement and poverty. The landmark report by the Intergovernmental Panel on Climate Change—the IPCC—warns dramatic action is needed over the next 12 years to hold global temperature rise below 1.5 degrees Celsius, or 2.7 degrees Fahrenheit, beyond which global crises could unfold at a rapid pace. The report comes as Governor Rick Scott has declared a state of emergency in parts of Florida, as forecasters predict Tropical Storm Michael could strengthen to become a major hurricane as it makes landfall late Wednesday.