91 The Sahara has seen snow 5 times in the last 43 years. Of these 4 have been in the last 7 years. (electroverse.net) posted 2 years ago by kula 2 years ago by kula +92 / -1 15 comments share 15 comments share save hide report block hide replies
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I think the real reason for 30-40 year cycles is that it is the typical length of a scientists career. So, if you make a forecast 30 years in the future you will never have to explain if it turns out to be wrong!