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 [Celsius], and raining sulfuric acid.
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"The universe is a vast and empty place, but it's full of potential."
"The world would be a much better place if everyone had a clear, rational view of the universe."
"I would like to know the mind of God, but I'm not sure God has a mind. He may just be a set of laws."
"The laws of nature are the same everywhere in the universe."
"The universe is a grand design, and we are but tiny parts of it."
British theoretical physicist whose Hawking radiation work and A Brief History of Time (1988) brought black-hole physics to a mass audience while he lived with ALS for 55 years. Closely associated with Roger Penrose (his collaborator on singularity theorems) and Carl Sagan (fellow popularizer who wrote Brief History's foreword). For an intellectual contrast, see William Lane Craig, American philosopher of religion — Craig's Kalam cosmological argument depends on the Big Bang requiring a divine first cause; Hawking's no-boundary proposal was specifically designed to remove the moment that would require one — the cleanest cosmology-vs-natural-theology contrast in modern thought.
Told BBC News, referring to President Trump's decision to pull the U.S. out of the Paris climate deal.
Date: 2017
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Earth is approaching a point of no return on climate change. Once crossed, warming accelerates beyond human ability to stop it. Hawking warns that specific political decisions—like withdrawing from climate agreements—could trigger runaway greenhouse effects transforming Earth into an uninhabitable hell-world similar to Venus, where temperatures melt metal and acid rains from the sky.
Hawking spent his career modeling extreme physical systems—black holes, the Big Bang, cosmic boundaries. He applied the same physics used to understand Venus's atmosphere to Earth's trajectory. A man who studied irreversible gravitational collapse recognized irreversible atmospheric collapse. His ALS diagnosis also gave him acute awareness that neglecting warnings has catastrophic, permanent consequences.
Hawking made this statement in 2017 following Trump's withdrawal from the Paris Climate Agreement. Global atmospheric CO2 had just surpassed 410 ppm for the first time in human history. Scientific consensus on anthropogenic climate change was overwhelming yet politically contested, making a globally recognized scientist's stark planetary comparison both urgent and deliberately provocative.
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