President Barack Obama said Tuesday the world needs to tackle climate change now.

"This one trend — climate change — affects all trends. If we let the world keep warming as fast as it is, and sea levels rising as fast as they are ... then before long we're going to have to devote more and more of our economic and military resources ... to adapting to the various consequences of a changing planet," Obama said. "This is an economic and security imperative that we have to tackle now."

Speaking at the COP21 Climate Change Summit in Paris, Obama urged other countries to agree on lower greenhouse gas emissions.



"Now, all of this will be hard. Getting 200 nations to agree on anything is hard," he said. "But I'm convinced we're going to get big things done here."