"Before the Paris Agreement was signed in 2015, the world was headed for anywhere between 3 and 5 degrees Celsius of warming by the end of the century (with a median increase of 3.7, as shown by the below chart), according to the Climate Action Tracker, a consortium of organizations that tracks efforts to reduce emissions. Today, the world is headed for 2.7 degrees Celsius warming — almost 5 degrees Fahrenheit — by the end of the century."