"C40 is a network of mayors of nearly 100 world-leading cities collaborating to deliver urgent action needed right now to confront the climate crisis." --from website

This page, on the United Nations Climate Change website, contains news and documents from the 26th Conference of the Parties held in Glasgow in October and November 2021.

This site, from United National Climate Change organization, includes definitions of climate change terminology and acronyms (e.g. carbon market, greenhouse gases, Kyoto Protocol).

This website of the Organization for Economic Cooperation and Development includes data and statistics on environmental topics in nations around the world.

Data formatted in charts by country about the environment (e.g. energy use, greenhouse gas emissions).

The Health Topics section on the World Health Organization's website includes sub-sections on Climate Change and on Environmental Health..