This publication provides technical supporting information for the 30 indicators and four chapter-specific call-out features that appear in the U.S. Environmental Protection Agency's (EPA's) report, Climate Change Indicators in the United States, 2014. EPA prepared this publication to ensure that each indicator is fully transparent-so readers can learn where the data come from, how each indicator was calculated, and how accurately each indicator represents the intended environmental condition. EPA uses a standard documentation form, then works with data providers and reviews the relevant literature and available documentation associated with each indicator to address the elements on the form as completely as possible.