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.