List of activists who have campaigned for greater awareness of climate change issues
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- Mary Mackey
- Arshak Makichyan
- Mazzella Maniwavie
- Michael E. Mann
- Roseline Mansaray
- Jamie Margolin
- Arkady Martine
- Xiuhtezcatl Martinez
- Mayssem Marzouki
- Chuck McDermott
- Lynn McDonald
- Amanda McKenzie
- Bill McKibben
- Róisín McLaren
- Ayakha Melithafa
- Yola Mgogwana
- George Monbiot
- Nyombi Morris
- Sergio Rossetti Morosini
- Kevin Mtai
- Marianna Muntianu
- Kaluki Paul Mutuku
- Mithika Mwenda