Nasa is out of line on global warming

Considering that the measures recommended by the world's politicians to combat global warming will cost tens of trillions of dollars and involve very drastic changes to our way of life, it might be thought wise to check the reliability of the evidence on which they base their belief that our planet is actually getting hotter.

There are four internationally recognised sources of data on world temperatures,but the one most often cited by supporters of global warming is that run by James Hansen of Nasa's Goddard Institute for Space Studies (GISS).

Hansen has been for 20 years the world's leading scientific advocate of global warming (and Al Gore's closest ally). But in the past year a number of expert US scientists have been conducting a public investigation, through scientific blogs, which raises large question marks over the methods used to arrive at his figures.