Karl Mathiesen is a Senior Correspondent on the enterprise team at POLITICO Europe, based in London. For five years before this, he was a Senior Climate Correspondent. As the former Editor-in-Chief of Climate Home News, where he was for three years, he specialised in the diplomacy and politics of climate change and led a team of reporters working around the world.
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Climate diplomacy glossary: Learn the lingo of international climate talks with this handy reference guide
UN climate diplomacy can be hard to follow. This glossary explains the key terms, groups and forums shaping the talks.
June 24, 2026
