He did a great job explaining how we can rule out natural warming of the earth. He pointed to the fact that night temperatures are still rising, ruling out any solar variability. He pointed to ice as a main indicator for the changes. He spoke of a scary concept regarding tipping points. He thinks we are near the threshold of warming and melting where we could be past the point of no return, or in other words have done irreversible damage to the point where even a drastic change in our practices will be obsolete. In regards to the ice as indicators he said that the new technology is a powerful tool and makes reading the patterns much easier. Some of his before and after glacier visuals were very powerful.
He noted that in 30 years there might actually be no glaciers left in glacier national park. Loss of glaciers at this rate, he said, could drastically affect our water supply. His ethos was on display when he took the view of skeptics who point to the natural ebb and flow of the earth's temperatures and glacial patterns but quickly noted that these recent patterns are outside this realm. His main research focused on glaciers and I like the term he used for their telling of the situation. He called glaciers, "the canaries in the coal mine," in that they are a great first indicator of how things are going to get bad.
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