In 2007, the Supreme Court handed down Massachusetts v. EPA, its first pronouncement on climate change and arguably the most important environmental law decision of the past decade. This book reviews that decision, but leaves coverage of the many EPA actions based on the decision to other CRS reports. This book also examines the trends in and factors affecting environmental litigation for fiscal years 1995 through 2010; and the Department of Justice’s recent costs and recent plaintiff payments from the Judgment Fund and EPA.