| [quote=jerryz]Global warning is total ****.....the world was much warmer 2000 years ago when the Romans grew vines in UK and also at the time of the Vikings Greenland was covered in crops and trees that why they called it Greenland."
And what happened to those Vikings in Greenland when the climate cooled again? They died off due to climate change!!!!! Surely that proves the converse to what you are saying?
Climate changes have been a factor in killing off (and encouraging) many human civilisations. Before humans, climate change has been responsible for global mass extinctions due to a variety of triggers. Fossil evidence sugests that at least some of these mass extinctions have been due to dramatic and very sudden shifts in global temperature. There are fossil forests in Antartica dating from when it was still over the South pole (~40 million years ago). The majority of climate scientists agree that AVERAGE global temperature is currently rising and if more than a few degrees wil cause pronounced disruption to the global climate. As I understand it, we do not know for absolute certain that the post-industrial CO2 rise is responsible for the current warming period but if it is we are in big trouble if we continue to pump CO2 into the air.
Keith  |