Former Vice President Al Gore at the U.N. Climate summit in Copenhagen, Denmark, on Monday, Dec. 14, 2009. (AP Photo/Anja Niedringhaus)

(CNSNews.com) - In his commencement speech at Hamilton College on Sunday, former Vice President Al Gore told the graduates that global warming is “the most serious challenge our civilization has ever faced.” But as an undergraduate at Harvard University in the late 1960s, Gore--one of the most prominent spokesmen on climate change today--earned a “D” in Natural Sciences.

Gore’s transcript documents that during his sophomore year at Harvard he earned a "D" in Natural Sciences 6 (Man’s Place in Nature). Also, as a senior at Harvard, he earned a C-plus in Natural Sciences 118.

Gore, along with the Intergovernmental Panel on Climate Change, was awarded the Nobel Peace Prize in 2007 for his work on global warming.

For his college board achievement tests, Gore earned a 488 (out of 800) in physics, and a 519 (out of 800) in chemistry. Gore’s academic records were first obtained and reported on by reporters David Maraniss and Ellen Nakashima at The Washington Post in March 2000.

Gore did relatively well, however, on the SAT, earning 1355 (out of 1600). For comparison, George W. Bush got 1206 on the SAT.

President Barack Obama has not released his academic records. He first attended Occidental College and then transferred in 1981 to Columbia University, where he earned his B.A. He later went to Harvard Law School and earned his J.D. in 1991.