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Temperature history
http://photos1.blogger.com/x/blogger...125/Graph1.jpg
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Welcome to the early 80's. The evidence has moved on a little since then and we know a fair bit more now. Since you seem not to understand that, I'll explain.
We've know for some time there are large cyclical variations in global temperature. However what we have recently come to understand is that human involvement is perturbing these cycles. Hence over the next hundred years we will see a rise in global temperatures well above that what we would expect purely as a result of the natural cycle.