A day before the U.N. Climate Action Summit, leading climate science organizations said on Sunday that nations must reduce "glaring and growing gaps" between what they will do and what they must do to fight global warming.
Their 28-page report, called "United in Science," concluded that countries will have to triple their carbon emissions-cutting targets to fulfill the 2015 Paris Agreement’s minimum goal of preventing average global temperatures from rising more than 2 degrees Celsius above pre-industrial levels.