As a result, in more than three dimensions the sun would not be able to exist in a stable state with its internal pressure balancing the pull of grav… - Stephen Hawking

When you are faced with the possibility of an early death, it makes you realise that there are lots of things you want to do before your life is over.

It is not clear that intelligence has any long-term survival value.

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.