I AM SURE THAT WE DON'T HELP THE PLANET WITH OUR POLUTANTS,,,, BUT IF ITS ALL US..THEN WHO WARMED THE EARTH ALL THE OTHER TIMES IN HISTORY??? DINOSAURS DIDN'T DRIVE!!
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[SIZE=+2]A Brief History of Ice Ages and Warming[/SIZE]
[SIZE=+3]G[/SIZE]lobal warming started long before the "Industrial Revolution" and the invention of the internal combustion engine. Global warming began 18,000 years ago as the earth started warming its way out of the
Pleistocene Ice Age-- a time when much of North America, Europe, and Asia lay buried beneath great sheets of glacial ice.
Earth's climate and the biosphere have been in constant flux, dominated by
ice ages and glaciers for the past several million years. We are currently enjoying a temporary reprieve from the deep freeze.
Approximately every 100,000 years Earth's climate warms up temporarily. These warm periods, called
interglacial periods, appear to last approximately 15,000 to 20,000 years before regressing back to a cold ice age climate. At year 18,000 and counting our current interglacial vacation from the Ice Age is much nearer its end than its beginning.
Global warming during Earth's current
interglacial warm period has greatly altered our environment and the distribution and diversity of all life. For example:
Approximately 15,000 years ago the earth had warmed sufficiently to halt the advance of glaciers, and sea levels worldwide began to rise.
By 8,000 years ago the land bridge across the Bearing Strait was drowned, cutting off the migration of men and animals to North America.