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A talk given at Green River Community College, January 2017
| One note: The exact proportion of the ~ 1 degC warming over the past ~ 100 years that is natural vs. human-caused is a topic of great debate now, both within the scientific community and between “skeptics” and climate scientists. Since this talk, I discovered that the consensus in the climate research community is this: Of the earth’s warming since 1950 (which is most of the warming over the past 100 years), it is highly likely that greater than 50% has been caused by humans. It’s all very interesting in the details, but The Big Picture is that the consensus among working climate scientists is that humans are responsible for a lot of recent warming. Maybe not all of it, but a lot. |