“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.”

ABC News interview (16 August 2006)

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Stephen Hawking122

British theoretical physicist, cosmologist, and author 1942–2018

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“Ladies and gentlemen, I am to talk to you about energy in the future. I will start by telling you why I believe that the energy resources of the past must be supplemented. First of all, these energy resources will run short as we use more and more of the fossil fuels. But I would […] like to mention another reason why we probably have to look for additional fuel supplies. And this, strangely, is the question of contaminating the atmosphere. […. ] Whenever you burn conventional fuel, you create carbon dioxide. […. ] The carbon dioxide is invisible, it is transparent, you can’t smell it, it is not dangerous to health, so why should one worry about it?
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Michele Bachmann (1956) American politician

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Nicholas Stern, Baron Stern of Brentford (1946) British economist and academic

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Bill Nye (1955) American science educator, comedian, television host, actor, writer, scientist and former mechanical engineer

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