Since 1984, the nonprofit organisation TED has been devoted to spreading ideas, usually in the form of short, powerful talks that cover topics ranging from science and business to global issues in more than 100 languages. In recent years, several speakers – from Al Gore and Allan Savory to Greta Thunberg and Naomi Klein – have started covering topics around global warming and the environment to spread awareness on some of the biggest issues of our times. Read on for a list of the most powerful and thought-provoking Ted Talks on climate change.