A friend sent me this. It's BBC's science nutshell summary of global warming. It explains the all important Gulf Stream ("Conveyor Belt") pretty simply. The main page is fairly benign, even relatively reassuring. If you click on Planet Under Pressure, there's more detail in that, less reassurance. http://news.bbc.co.uk/1/shared/spl/hi/sci_nat/04/climate_change/html/gulf.stm