tag:blogger.com,1999:blog-12339127.post5727525769762030500..comments2024-01-13T01:17:55.325-06:00Comments on Tom Nelson: NY Times suggests that if we all move back into caves and don't start any cooking fires, maybe the dry spells in the American Southwest will only span four centuries, like they did when CO2 was at "safe" levelsTomhttp://www.blogger.com/profile/08119241500221931600noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-12339127.post-68597264723412443352011-11-07T18:16:49.177-06:002011-11-07T18:16:49.177-06:00"while it has not been definitively proven to..."while it has not been definitively proven to exist, evidence for the idea is growing."<br /><br />The Roman Warm Period was proven in the oxygen isotope record of the GISP2 Greenland ice core in the late 1990s.Don Easterbrooknoreply@blogger.com