Climate Science Program

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Reports on Climate Science Literacy

Climate Literacy Brochure

Climate Literacy:
The Essential Principles of Climate Sciences

Earth Science Literacy Brochure

Earth Science Literacy Principles

National Climate Assessment Full Report (more...) (PDF 174 MB)
Highlights (more...) (PDF 116 MB)
Draft Report (more...)
Frequently Asked Questions (more...)
Videos (more...)

2012 State of the Climate Report (more...)

25x'25 Alliance Reports on Agriculture and Forestry in a Changing Climate (more...)

Reports of the United State Department of Agriculture (USDA)

USDA Climate Adaptation

Climate Change and Agriculture in the United States: Effects and Adaptation

USDA Climate Forest

Effects of Climatic Variability and Change on Forest Ecosystems

Reports of the Intergovernmental Panel on Climate Change (IPCC)

Fifth Accessment Report (AR5)

The AR5 Synthesis Report

IPCC 2013 Report Group I

Working Group I Report
"The Physical Science Basis"

IPCC 2014 Report Group II

Working Group II Report
"Impacts, Adaptation and Vulnerability"

IPCC 2014 Report Group III

Working Group III Report
"Mitigation of Climate Change"

Fourth Accessment Report (AR4)

IPCC Report 2007 AR4

The AR4 Synthesis Report

IPCC 2007 Report Group 1

Working Group I Report
"The Physical Science Basis"

IPCC Report 2007 Group 2

Working Group II Report
"Impacts, Adaptation and Vulnerability"

IPCC Report 2007 Group3

Working Group III Report
"Mitigation of Climate Change"

Third Assessment Report (AR3)

Reports of the US Climate Change Science Program (CCSP)

Synthesis and Assessment Products

CCSP Product 1.1

Product 1.1: Temperature Trends in the Lower Atmosphere

CCSP Product 2.1A

Product 2.1A: Scenarios of Greenhouse Gas Emissions...

CCSP Product 2.1B

Product 2.1B:
Global-Change Scenarios

CCSP Product 2.2

Product 2.2: The First State of the Carbon Cycle Report (SOCCR)


America's Climate Choices, US National Academies of Science (more...)

Climate Data Guide, National Center for Atmospheric Research (more...)

Climate Projections FAQ, US Department of Agriculture (more...)

Climate Engineering Fact Sheet, NOAA Research Council (more...)

The Easter Freeze of April 2007: A Climatological Perspective and Assessment of Impacts and Services (PDF 23.5MB)

Water, People, and the Future: Water Availability for Agriculture in the United States (PDF 8.6MB)

Climate Impacts Report

Global Climate Changes Impacts in the United States,
U.S. Global Change Research Program

(PDF 13.1MB)

NSF Climate Puzzle

Solving the Puzzle: Researching the Impacts of Climate Change Around the World, National Science Foundation

(PDF 5.0MB)

Position Statements on Climate Change by Scientific Societies

American Chemical Society (ACS) Position

Careful and comprehensive scientific assessments have clearly demonstrated that the Earth's climate system is changing rapidly in response to growing atmospheric burdens of greenhouse gases and absorbing aerosol particles (IPCC, 2007). There is very little room for doubt that observed climate trends are due to human activities. The threats are serious and action is urgently needed to mitigate the risks of climate change. The reality of global warming, its current serious and potentially disastrous impacts on Earth system properties, and the key role emissions from human activities play in driving these phenomena have been recognized by earlier versions of this ACS policy statement (ACS, 2004), by other major scientific societies, including the American Geophysical Union (AGU, 2003), the American Meteorological Society (AMS, 2007) and the American Association for the Advancement of Science (AAAS, 2007), and by the U. S. National Academies and ten other leading national academies of science (NA, 2005). This statement reviews key global climate change impacts and recommends actions required to mitigate or adapt to currently anticipated consequences. More...

American Meteorological Society

The American Meteorological Society (AMS) Council adopted a new statement on climate change in August 2012.

The statement reads, in part,

"There is unequivocal evidence that Earth’s lower atmosphere, ocean, and land surface are warming; sea level is rising; and snow cover, mountain glaciers, and Arctic sea ice are shrinking. The dominant cause of the warming since the 1950s is human activities. This scientific finding is based on a large and persuasive body of research. The observed warming will be irreversible for many years into the future, and even larger temperature increases will occur as greenhouse gases continue to accumulate in the atmosphere. Avoiding this future warming will require a large and rapid reduction in global greenhouse gas emissions. The ongoing warming will increase risks and stresses to human societies, economies, ecosystems, and wildlife through the 21st century and beyond, making it imperative that society respond to a changing climate. To inform decisions on adaptation and mitigation, it is critical that we improve our understanding of the global climate system and our ability to project future climate through continued and improved monitoring and research. This is especially true for smaller (seasonal and regional) scales and weather and climate extremes, and for important hydroclimatic variables such as precipitation and water availability."

"Technological, economic, and policy choices in the near future will determine the extent of future impacts of climate change. Science-based decisions are seldom made in a context of absolute certainty. National and international policy discussions should include consideration of the best ways to both adapt to and mitigate climate change. Mitigation will reduce the amount of future climate change and the risk of impacts that are potentially large and dangerous. At the same time, some continued climate change is inevitable, and policy responses should include adaptation to climate change. Prudence dictates extreme care in accounting for our relationship with the only planet known to be capable of sustaining human life.."

Read the complete statement as follows:

Climate Change: An Information Statement of the American Meteorological Society

AGU revises position on climate change

Public release date: August 5, 2013
Contact: Peter Weiss
American Geophysical Union

WASHINGTON - The American Geophysical Union today released a revised version of its position statement on climate change. Titled "Human-Induced Climate Change Requires Urgent Action," the statement declares that "humanity is the major influence on the global climate change observed over the past 50 years" and that "rapid societal responses can significantly lessen negative outcomes." AGU develops position statements to provide scientific expertise on significant policy issues related to Earth and space science. These statements are limited to positions that are within the range of available geophysical data or norms of legitimate scientific debate.

AGU's position statements are renewed every 4 years. The climate change position statement was first adopted in December 2003. It was then revised and reaffirmed in December 2007, and again in February 2012.

The full text of the revised statement is available online at