Is global warming human fault or morther nature taking its course?
The Earth is in an interglacial period now, the last retreat ending about 10,000 years ago. There appears to be a conventional wisdom that "the typical interglacial period lasts ~12,000 years" but this is hard to substantiate from the evidence of ice core records. For example, an article in Nature argues that the current interglacial might be most analogous to a previous interglacial that lasted 28,000 years.
Based on predicted changes in orbital forcing, in the absence of human influence, the current interglacial may be expected to last 50,000 years: see Milankovitch cycles. However anthropogenic forcing from increased "greenhouse gases" probably outweighs orbital forcing and the prediction for the next few hundred years is for temperature rises.
The Romans gre vines in the UK and we are only just able to do the same.
2007-02-17
18:20:18
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13 answers
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asked by
Andrew R
2