The IPCC is a part of the United Nations. The purpose of the organization is the scientific study of climate change. It is considered one of the top sources of information on that topic.
This report by the IPCC offers comprehensive information on how the planet is changing due to human caused climate changes.
This article defines climate change and provides information about what causes it, what are its many effects, and some information on solutions to climate change.
Harvard Center for the Environment takes a scientific approach to the issue of climate and human-caused climate change. There are an interesting array of articles on this topic in this section of the Harvard website.
The EPA works to provide information on climate, including information on climate change science.
Climate Change Indicators provide a way to detect, measure and utilize the available information regarding climate change. Information regarding long-term trends of climate change are an important priority in the use of indicators.
The National Oceanic and Atmospheric Administration (NOAA) presents the tools and technology of climate science, including studies on climate change.