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.

The victim should have the right to end his life, if he wants. But I think it would be a great mistake. However bad life may seem, there is always something yo…

The downside of my celebrity is that I cannot go anywhere in the world without being recognized. It is not enough for me to wear dark sunglasses and a wig. The…

Equations are just the boring part of mathematics. I attempt to see things in terms of geometry.

[George W.] Bush explained that he wasn't willing to take the steps outlined in the Kyoto accords - steps that both the scientific world and the international …

Back then (in 1985) the issue of the day was nuclear testing, now we are faced with problems such as climate change, overfishing, deforestation, shipments of r…

And they say there's no global warming but right now the North Pole is a pool...there's things just floating away. Right now we are beyond global warming, at t…