What's Happening to Our Climate: Natural Factors Cannot Explain the Recent Warming
This classroom resource is a combination of 3 visualizations and accompanying text that illustrate how 3 key natural phenomena - cyclical changes in solar energy output, major volcanic eruptions over the last century, and El Nino/Nina cycles - are insufficient to explain recent global warming.
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Aspen Global Change Insitution
Climate Conncection
![](https://webarchive.library.unt.edu/web/20161231012931im_/https://www.climate.gov/sites/default/files/tc_syndicated_content/serc-clean-dc-27437.png)
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