A UN report says stopping climate change is possible but action is needed now
The world already has the tools to cut global greenhouse gas emissions in half by 2030
A lily pad of solar panels, part of an electricity plant in the making, floats on a lake in Haltern, Germany, on April 1. A new U.N. report outlines numerous changes the world can make now, including shifting to solar and other sources of renewable energy, that would halve global greenhouse gas emissions by 2030.
Martin Meissner/AP images