Climate Change Indicators in the United States
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The Earth’s climate is changing. Temperatures are rising, snow and rainfall patterns are shifting, and more extreme climate events—like heavy rainstorms and record high temperatures—are already taking place. Scientists are highly confident that many of these observed changes can be linked to the climbing levels of carbon dioxide and other greenhouse gases in our atmosphere, which are caused by human activities.
EPA is working with many other organizations to collect and communicate data about climate change. With help from these partners, EPA has compiled the third edition of this report, presenting 30 indicators to help readers understand observed long-term trends related to the causes and effects of climate change. In a manner accessible to all audiences, the report describes the significance of these trends and their possible consequences for people, the environment, and society. Most indicators focus on the United States, but some include global trends to provide context or a basis for comparison, or because they are intrinsically global in nature. All of the indicators presented relate to either the causes or effects of climate change, although some indicators show trends that can be more directly linked to human-induced climate change than others. EPA's indicators are based on peer-reviewed, publicly-available data from various government agencies, academic institutions, and other organizations. EPA selected these indicators based on the quality of the data and other criteria, using historical records that go back in time as far as possible without sacrificing data quality.
Indicators will be updated periodically on the Web as newer data become available. For additional information about EPA’s climate change indicators, see Frequent Questions.
Climate Change Indicators
* = new in 2014