Ice ages and interglacial periods; cooling and warming (25/01/14 12:15:58)
We are now in an interglacial period. According to the .no Wikipedia page previous interglacial periods have been oscillating. According to the previous periodicity Earth would be due for a new ice age. If so, global warming would postpone or cancel it.
Previous ice ages - well, much of the present bare land was covered in ice, and sea levels elsewhere could be 100 m lower owing to all the ice deposits on land. (that water would be saltier too, wouldn't it?)
I believe we have goog reasons to be afraid of global warming because it may have quick and dramatic negative effects on water supply and food production. An ice age would come more slowly because buildup of large ice deposits on land is a lengthy and slow process. But a disaster nonetheless.
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