An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Natural and Anthropogenic Influences on Earth's Surface Temperature

This is a presentation by Judith Lean of the U.S. Naval Research Laboratory about multivariate analysis as one approach for quantifying the natural and anthropogenic components of the surface temperature record simultaneously. This presentation was given for a seminar titled Natural and Anthropogenic Influences on Earth’s Surface Temperature.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.