Collections of data on global climate change from the U.S. Department of Energy. Topics include carbon dioxide, water vapor, atmospheric trace gasses, energy and socioeconomic systems, energy balances, and gas emissions.
Data portal for the United Nations Environment Programme. GEO has 450 different variables at the national, regional and global level on topics like fresh water, population, forests, emissions, climate, disasters, and health.
From the Pacific Institute, and environmental advocacy group. Includes data on fresh water, water consumption, water industry revenue, sanitation, and other topics. the data is also published in the Pacific Institute's annual data report, "The World's Water".