Stephen Hawking on global warming

Stephen Hawking's warning: Earth could become as hot as Venus... Which, by the way, is 250 degrees.

Transcript

00:00We are close to the tipping point where global warming becomes irreversible.

00:18Trump's action could push the earth over the bridge to become like Venus with a temperature of

00:25250 degrees and raining sulfuric acid.

00:30Climate change is one of the great dangers we face and it's one we can prevent if we act now.

01:00By denying the evidence for climate change and pulling out of the Paris climate agreement,

01:09Donald Trump will cause avoidable environmental damage to our beautiful

01:14planet and endangering the natural world for us and our children.