Rohrabacher, who is of German and English descent, was born June 21, 1947, in Coronado, California, the son of Doris M. (nee Haring) and Donald Tyler Rohrabacher. He attended elementary school locally, and during his college years, he lived in Sunset Beach. Rohrabacher graduated from Palos Verdes High School in Palos Verdes Estates, California, attended Los Angeles Harbor College, and earned a bachelor's degree in history at California State University, Long Beach in 1969. He received his master's degree in American Studies at the University of Southern California.

Rohrabacher doubts that global warming is caused by humans. During a congressional hearing on climate change on February 8, 2007, Rohrabacher mused that previous warming cycles may have been caused by carbon dioxide released into the atmosphere by "dinosaur flatulence": "In fact, it is assumed at best to be unproven and at worst a liberal claptrap, trendy, but soon to go out of style in our new Congress." Politico and the New York Times reported that on May 25, 2011, Rohrabacher expressed further skepticism regarding the existence of man-made global warming and suggested that, if global warming is an issue, a possible solution could be clear-cutting rain forests, and replanting. These reports sparked strong criticism by some scientists, including Oliver Phillips, a geography professor at the University of Leeds. They noted the consensus that intact forests act as net absorbers of carbon, reducing global warming. In response, Rohrabacher stated,  Once again those with a global agenda have created a straw man by misrepresenting the position of their critics. I do not believe that CO2 is a cause of global warming, nor have I ever advocated the reduction of CO2 through the clearing of rainforests or cutting down older trees to prevent global warming. But that is how my question to a witness during my subcommittee hearing on May 25th is being reported. I simply asked the witness, Dr. Todd Stern, who is a supporter of a global climate treaty that would dramatically hurt the standard of living for millions of human beings, if he was considering a policy that would address naturally emitted carbon dioxide, which makes up over 90% of emissions. To suggest that I'm advocating such a radical approach instead of simply questioning the policy is a total misrepresentation of my position.  Rohrabacher does not believe that global warming is a problem. At a town hall meeting with the Newport Mesa Tea Party in August 2013, Rohrabacher said "global warming is a total fraud" and part of a "game plan" by liberals to "create global government".

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