A:
Ask Dr. Global Change - Assists researchers, students, educators, decision makers and the general public find information and data relevant to global environmental change [Multiple agencies involved]
Ask a Scientist About the Earth's Environment or Climate - Designed especially for students [National Aeronautics and Space Administration (NASA)]
Atmospheric Radiation Measurement Program (ARM) - Obtains field measurements and develops models to understand the processes that control solar and thermal infrared radiative transfer in the atmosphere and at the earth's surface [Department of Energy (DOE)]
Atmospheric Science Division - Studying the mechanisms of global environmental and climatic change through the development and diagnosis of state-of-the-art models of processes affecting the atmosphere, oceans, and biosphere [Department of Energy (DOE), Lawrence Livermore National Laboratory (LLNL)]

C:
Carbon Dioxide Information Analysis Center (CDIAC) and the World Data Center for Atmospheric Trace Gases - Information on the greenhouse effect and global climate change [Department of Energy (DOE), Oak Ridge National Laboratory (ORNL)]
Center for Climate Change and Environmental Forecasting - The focal point in the DOT of technical expertise on transportation and climate change [Department of Transportation (DOT)]
Climate Change Atlas for 80 Forest Tree Species of the Eastern United States - [Department of Agriculture (USDA), Forest Service]
Climate Diagnostics Center (CDC) - Identifies the nature and causes for climate variations on time scales ranging from a month to centuries [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA)]
Climate Information Project (CIP) - Promotes the use, distribution, and production of climate information [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA)]
Climate Monitoring and Diagnostics Laboratory (CMDL) - Conducts research related to atmospheric constituents that are capable of forcing change in the climate of the Earth or that may deplete the ozone layer [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA); Office of Oceanic and Atmospheric Research (OAR)]

D:
Deserts - Information on the effects of global warming on deserts [Environmental Protection Agency (EPA)]

E:
Earth - Explores the Earth's air, land and seas to learn more about our home planet and understand how other planetary systems may work [National Aeronautics and Space Administration (NASA), Jet Propulsion Laboratory (JPL)]
Earth Surface Processes - Homepage for Earth Surface Processes Team with research studies in two general categories: climate change and geologic mapping. Links to research activities, available data sets, workshop, and programs. [Department of the Interior, U.S. Geological Survey (USGS)]
Ecosystem and Global Change Science - Conducts research on greenhouse gas emissions, the global carbon cycle, Conducts research on ecological systems, regional climate predictions, consequences of climate change, technologies to reduce greenhouse gas emissions, and policy and technology solut [Department of Energy (DOE), Oak Ridge National Laboratory (ORNL)]
Educational Sites for All Ages - All science subjects, with emphasis on biology, chemistry, and environmental science. [Department of Energy (DOE); Biological and Environmental Research Program]
Environmental Technology Laboratory (ETL) - Collaborate with colleagues around the world to create advanced remote sensors to meet environmental challenges [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA); Office of Oceanic and Atmospheric Research (OAR)]

F:
FrogWeb: Amphibian Declines & Deformities. - Provides information about recent global declines and deformities among amphibian populations. [Department of the Interior, U.S. Geological Survey (USGS); National Biological Information Infrastructure (NBII)]

G:
Global Change Data and Information System (GCDIS) - Locates multiagency news, data, publications, and research [Ad Hoc Organizations; U.S. Global Change Research Program (USGCRP)]
Global Change Research Programs - Research programs support research and related activities that advance fundamental understanding of dynamic physical, biological, and socioeconomic systems as well as interactions among those systems [National Science Foundation (NSF)]
Global Hydrology and Climate Center (GHCC) - Studies the global water cycle and its effect on the climate [National Aeronautics and Space Administration (NASA)]
Global Warming - Presents information on the very broad issue of climate change and global warming [Environmental Protection Agency (EPA)]
Global change research - earth surface dynamics - Homepage for USGS Global Change Research projects which seek to understand the interrelationships among earth surface processes, ecological systems, and human activities. Links to projects with descriptions and products and downloadable poster. [Department of the Interior, U.S. Geological Survey (USGS)]
Goddard Institute for Space Studies (GISS) - Prediction of atmospheric and climate changes in the 21st century based on research of global datasets [National Aeronautics and Space Administration (NASA), Goddard Space Flight Center (GSFC)]

N:
National Activities of the USGS Biological Resources Discipline - Links to national programs, including biomonitoring, bird banding, gap analysis, integrated taxonomy, breeding birds, nonindigenous species, and vegetation mapping. [Department of the Interior, U.S. Geological Survey (USGS)]
National Center for Atmospheric Research (NCAR) - Serves as a focus for research on atmospheric and related science problems to understand the earth system, including climate change, weather, and the impacts of all of these components on human societies [National Science Foundation (NSF)]

P:
Paleoclimatology Program - NOAA - Paleoclimatic data, research, and information [Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA); National Climatic Data Center]

T:
Teacher Online Resources, Biodiversity & Environment. - Educational resources on biodiversity & environment compiled by the NBII, an NBII Information Node. [Department of the Interior, U.S. Geological Survey (USGS)]

U:
US Global Change Research Information Office (GCRIO) - Provides access to selected bibliographic data bases; web sites at the participating federal agencies; relevant environmental data, catalog, and library systems; and a section that deals with environmental education [Multiple agencies involved]
US Global Change Research Program (USGCRP) - Sponsors research to understand the vulnerabilities to changes in important environmental factors, including changes in climate, ultraviolet (UV) radiation at the Earth's surface, and land cover [Ad Hoc Organizations, National Science Foundation (NSF)]
US Global Change Research Program: Composition and Chemistry of the Atmosphere - Contains links to related web sites, including the USDA Forest Service's Global Change Research Program [Department of Agriculture (USDA)]