Global Warming Climate Change

The Thousands of studies conducted by researchers around the world have documented increases in temperature at Earth’s surface, as well as in the atmosphere and oceans. Many other aspects of global

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Thousands of studies conducted by researchers around the world have documented increases in temperature at Earth’s surface, as well as in the atmosphere and oceans. Many other aspects of global climate are changing as well. Human activities, especially emissions of heat-trapping greenhouse gases from fossil fuel combustion, deforestation, and land-use change, are the primary driver of the climate changes observed in the industrial era. Earth’s climate is now changing faster than at any point in the history of modern civilization, primarily as a result of human activities. Global climate change has already resulted in a wide range of impacts across every region of the country and many sectors of the economy that are expected to grow in the coming decades.

The Fourth National Climate Assessment (NCA4), developed by the U.S. Global Change Research Program (USGCRP), is a state-of-the-science synthesis of climate knowledge, impacts, and trends across U.S. regions and sectors to inform decision making and resilience-building activities across the country. It is the most comprehensive and authoritative assessment to date on the state of knowledge of current and future impacts of climate change on society in the United States.

Explore the physical science of climate change in NCA4 Volume I, the Climate Science Special Report.

Understand the impacts of climate change on regions and sectors across the United States in NCA4 Volume II: Impacts, Risks, and Adaptation in the United States.

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