Obama on climate: 'There is such a thing as being too late'

President Obama warned Monday in Paris that there is little time to act to halt the effects of climate change, and said the threat of climate change could define the 21st century.

“One of the enemies that we’ll be fighting at this conference is cynicism, the notion we can’t do anything about climate change,” Obama said the United Nations Framework Convention on Climate Change, also known as COP21. “Our progress should give us hope during these two weeks — hope that is rooted in collective action.”