Whether they're push-pedalling for legislative change, or diving headfirst into environmental issues, sports stars are increasingly ploughing their energy into saving the planet.
Click on the thumbnails to reveal which sports legends are leading the global warming league in this gallery from Grist.
Find out more at Grist.org
More green content on MSN
A geographical look at global warming hotspots across the earth, with Windows Live Maps.More on the environment from MSN
Natural wonders feel the heat
From fragile coral reefs to indigenous peoples, some of the world's most spectacular natural wonders are feeling the heat of climate change - with potentially catastrophic results.
Climate change
Find out what the impact of climate change will be on the region where you live.
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