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We totally do. There is an international scientific consensus that we're significantly responsible for the current climate change.
Please provide me a 200 year sample of weather statistics from some 65 million years ago. Also please provide one every 20 millions years (45, 25, 5) I would also like a source with accurate climate readings from the years 12000 BC 10000BC 8000BC, 100AD, 1100AD, 1491 AD.
If you can show to me that humans have altered the global cycle to a drastic degree ill buy into global warming loony talk. We may have had an impact, but like so has every other dominate species (maybe not to the extent we have). If you have to ask questions about what about before we kept records, then you can't really proove anything.
Nearly every global warming spiel cites after a few hundred years of records we have found the temperature has increased, we think we did something to it, so ya Global Warming. The earth has been around for billions of years, we have no idea how it functions, and it is naive to think we do.
(unless you are a religious nutbar and believe it all poofed into existance 10,000 years ago.)