Over the past decade, the state of California has set aggressive greenhouse gas emissions targets across all sectors of the economy. The first major target occurs in 2020, when the state hopes to have reduced statewide greenhouse gas emission from their current levels to 1990 levels. This 320-page paper from RAND researcher Ryan Keefe takes a critical look at the policies adopted by California in its attempt to achieve these long-term goals. Visitors can look over the complete document if they are so inclined, but there is a brief summary available as well. The paper provides a history of climate policy in California, sections on policy options for reducing greenhouse gas emissions from automobiles, and new methods for evaluating California's light-duty transportation policies. Finally, the paper also includes a wealth of graphs, charts, and technical appendices.