Read
what John Houghton, the former head of the UK Meteorological Office,
has
to say (2003/07/29)
political
comment on this science in the Guardian
And (this should scare you, if nothing else does) read
what the US Department of Defense thinks about global warming (Observer
2004/02/22)
Here's the data: http://www.met-office.gov.uk/research/hadleycentre/obsdata/globaltemperature.html

Graph from http://www.met-office.gov.uk/research/hadleycentre/CR_data/Annual/HadCRUG.gif