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"But recent experience down here suggests that what we're looking at in the last few decades is at least as severe and maybe more so than anything we've seen since the last Ice Age." A build-up of fuels from forestry practices that emphasized fire suppression is partly responsible, he said, "but part of it as well--and the data are very good on this --it's climatic warming", as human industrial activity and land-use changes have pumped increasing amounts of carbon dioxide into the atmosphere. Change in the average date of onset of the spring snow melt runoff pulse between 1950 - 1999.