Seven million people died prematurely in 2012 from air pollution caused by fossil fuel combustion, according to a 2014 report by the World Health Organization. So President Trump’s decision to halt U.S. compliance with the 2015 Paris climate agreement is a blow not just to climate science and international diplomacy — it’s also a looming disaster for public health, reports Scientific American. A review of dozens of studies published between 2009 and 2014 link climate change to increases in a wide range of health problems, including asthma and other respiratory disorders, heart disease induced by heat stress, infectious diseases, waterborne diseases that can cause dangerous bouts of diarrhea in children, and mental health issues such as depression and PTSD following climate-related natural disasters such as hurricanes.