Climate Change
Climate Change Indicators in the United States
Key Findings
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- The Climate Change Indicators information on this website is drawn from a print report published in 2010.Access the pdf of the 2010 report (including technical documentation).
- Order print copies of the report or send inquires by emailing climateindicators@epa.gov.
Over the last several decades, evidence of people's influences on climate change has become increasingly clear and compelling. Warming of the climate system is well-documented--evident from increases in global average air and ocean temperatures, widespread melting of snow and ice, and rising sea levels.
EPA is working with many other organizations to better understand the causes and effects of climate change. With help from these partners, EPA produced a report, Climate Change Indicators in the United States, that presents 24 indicators that show trends related to the causes and effects of climate change. Most of the indicators focus on the United States, but some include global trends to provide context or a basis for comparison. These indicators represent a selected set of key climate change measurements, and are not an exhaustive group of all climate change indicators.
EPA's indicators are based on peer-reviewed data from various government agencies, academic institutions, and other organizations. EPA selected these indicators based on the quality of the data and other criteria. Each indicator features easy-to-understand graphs or maps, along with a description of key points, data sources, and any factors that might contribute to the overall confidence of the indicator and the underlying trends. Ultimately, these indicators will help EPA and its constituents evaluate the progress of their efforts to respond to climate change and effectively communicate observed climate change impacts.
Use this site to learn more about EPA's indicators related to greenhouse gases, weather and climate, oceans, snow and ice, and society and ecosystems.
Why are indicators important?
Scientists, analysts, decision-makers, educators, and others use indicators as a tool for:
- Assessing trends in environmental quality, factors that influence the environment, and effects on ecosystems and society.
- Evaluating existing and future programs.
- Providing sound science to inform decision-making and facilitate meaningful communication.
Indicators from the 2010 Report
- Snow and Ice
- Arctic Sea Ice
- Glaciers
- Lake Ice
- Snow Cover
- Snowpack
- Society and Ecosystems
- Length of Growing Season
- Plant Hardiness Zones
- Leaf and Bloom Dates
- Bird Wintering Ranges