Check out the video "The Global Warming Swindle"...
http://www.youtube.com/watch?v=lIjGynF4qkE
The film's basic premise is that the current scientific consensus on the anthropogenic causes of global warming has numerous scientific flaws, and that vested monetary interests in the scientific establishment and the media discourage the public and the scientific community from acknowledging or even debating this. The film asserts that the publicised scientific consensus is the product of a "global warming activist industry" driven by a desire for research funding. Other culprits, according to the film, are Western environmentalists promoting expensive solar and wind power over cheap fossil fuels in Africa, resulting in African countries being held back from industrialising.

A number of academics, environmentalists, think-tank consultants and writers are interviewed in the film in support of its various assertions. They include the Canadian environmentalist Patrick Moore, founding member of Greenpeace but for the past 21 years a critic of the organisation; Richard Lindzen, professor of meteorology at the Massachusetts Institute of Technology; Patrick Michaels, Research Professor of Environmental Sciences at the University of Virginia; Nigel Calder, editor of New Scientist from 1962 to 1966; John Christy, professor and director of the Earth System Science Center at University of Alabama; Paul Reiter of the Pasteur Institute; the former British Chancellor of the Exchequer, Nigel Lawson; and Piers Corbyn, a British weather forecaster.

Carl Wunsch, professor of oceanography at the Massachusetts Institute of Technology, was also interviewed but has since said that he strongly disagrees with the film's conclusions and the way his interview material was used.[7]

This is not an easy question to answer. I read somewhere that Stephen Hawking does not think we have another 100 years left on this earth. Obviously, if there isn't a nuclear holocaust some will survive, but it will be a small group of rich people. Cynical I know :(