What is Climate Change? | Start Here

The hard facts about global warming - a defining issue of our time. Climate change is happening now, and even world leaders meeting for climate talks at this year’s Cop25 know we aren’t doing enough to stop it. In fact, we’re going backwards. The UN says carbon dioxide levels in our atmosphere are going up, and the earth is on track to warm by 3.2 degrees before the century is over. The consequences of that acceleration are already proving disastrous for communities around the world.