United States

U.S. Environmental Protection Agency

U.S. Environmental Protection Agency

Climate Change - Water Resources

Clean Energy - Power Profiler

Coastal Sensitivity to Sea-Level Rise Report 

Greenhouse Gas Emissions  

2102 Draft U.S. Greenhouse Gas Inventory Report

U.S. Committee on Energy and Commerce’s Climate Change Legislation Discussions

USGS

USGS Global Climate Change

USGS, Global Climate Change & Wetlands, National Wetlands Research Center

NOAA

NOAA Climate

NOAA National Climatic Data Center

NASA

NASA Global Warming and Climate Change Policy

NASA Goddard Institute for Space Studies News & Features

United States Department of Energy

U.S. Department of Energy - Climate Change

EIA - Official Energy Statistics from the U.S. Government

EIA - Emissions of Greenhouse Gases in the U.S. 2006

U.S. Global Change Research Program

Ducks Unlimited, Wetlands & Climate Change
 
Alaska Center for Climate Assessment and Policy, University of Alaska, Fairbanks
 
Bonanza Creek Long-Term Ecological Research, Affiliate of University of Alaska
 
Global Warming in the South, Southern Environmental Law Center 

Future Climate Data Download Available From IPPC
IPPC 3rd Assessment data. Future climate projections, calibrated and statistically downscaled using the WorldClim data for 'current' conditions. 

United Nations Framework Convention on Climate Change [UNFCC] GHG data 

Climate Change & Wildlife Management
Association of Fish & Wildlife Agencies’ Climate Change page
 
Purdue Unversity’s Climate Change Research Center 
 
Climate Adaptation Knowledge Exchange 
 
Climate Central

Climate Central is a nonprofit, collaborative group of scientists and communicators working to bridge the gap between the scientific community and the public and providing clear, honest, nonpartisan, and up-to-date information to help people make sound decisions about climate and energy.  Their website provides users with useful resources about climate impacts, responses, trends, projections, and energy. 

The White House Administration’s Climate Change Adaptation Task Force

U.S. Wetlands & Carbon Sequestration Links
 
Big Sky Carbon Sequestration Partnership (has good list of recent publications & reports)
Publications   Reports list

Conservation Fund Carbon Sequestration Program

Duck’s Unlimited Carbon Sequestration Program

Canada

Environment Canada, Wetlands & Climate Change

Great Britain
 
Peatlands, Climate Change & Global Carbon Stores
 
International Organizations
 
United Nations Climate Change 
 
Intergovernmental Panel on Climate Change