The Earth is at a tipping point. Here's what's at stake if we don't act on climate change
In his remarks to global leaders, President Joe Biden said climate change is "ravaging the world" — a message that is likely to be repeated at the U.N. summit on climate change. World leaders, researchers and activists all say we are at a tipping point to reduce emissions. But getting commitments that translate to real change is no small lift. William Brangham reports on the stakes of the summit.
Source: pbs.org