Tipping point

The Cambridge physicist regarded global warming as one of the biggest threats to life on the planet. The physicist was particularly fearful of a so-called tipping point, where global warming would become irreversible. He also expressed concern about America's decision to pull out of the Paris Agreement.

"We are close to the tipping point where global warming becomes irreversible. Trump's action could push the Earth over the brink, to become like Venus, with a temperature of 250 degrees, and raining sulphuric acid,"