Stephen Hawking · Danger Quotes
The danger is that global warming may become self-sustaining, if it has not done so already. The melting of the Arctic and Antarctic ice caps reduces the fraction of solar energy reflected back into space, and so increases the temperature further. Climate change may kill off the Amazon and other rain forests, and so eliminate once one of the main ways in which carbon dioxide is removed from the atmosphere. The rise in sea temperature may trigger the release of large quantities of carbon dioxide, trapped as hydrides on the ocean floor. Both these phenomena would increase the greenhouse effect, and so global warming further. We have to reverse global warming urgently, if we still can.
As scientists, we understand the dangers of nuclear weapons and their devastating effects, and we are learning how human activities and technologies are affecting climate systems in ways that may forever change life on Earth. As citizens of the world, we have a duty to alert the public to the unnecessary risks that we live with every day, and to the perils we foresee if governments and societies do not take action now to render nuclear weapons obsolete and to prevent further climate change...There’s a realization that we are changing our climate for the worse. That would have catastrophic effects. Although the threat is not as dire as that of nuclear weapons right now, in the long term we are looking at a serious threat.
At a press conference for the Bulletin of the Atomic Scientists (2007-01-17)
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Stephen William Hawking, CH, CBE, FRS (born 1942-01-08) is a British theoretical physicist.
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Sources by Stephen Hawking
A Brief History of Time
The Beginning of Time
Newton's Principia, 300 Years of Gravitation
The Art of War
Long Walk to Freedom
The Notebooks of Leonardo da Vinci
The World As I See It
Out of My Later Years
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