Stephen Hawking: Runaway climate change is biggest threat to our world.

In an interview with ITV’s Good Morning Britain, Professor Stephen Hawking has said that the greatest threat to humanity is human-caused climate change.

“A rise in ocean temperature would melt the ice-caps, and cause a release of large amounts of carbon dioxide from the ocean floor. Both effects could make our climate like that of Venus, with a temperature of 250 degrees.”