He is not as well known as Al Gore or David Attenborough but among green campaigners, no one has a bigger role in tackling climate change than Ma Jun.

As China's economic growth races on at breakneck speed and with more dirty, coal-burning power plants coming on line each year, the world's most populous nation will soon overtake the US as the biggest greenhouse gas emitter.

Ma, 39, has emerged as the powerful voice of a budding green movement that is forcing industry and China's tightly run state to be more accountable for the long-term consequences of their rush to get rich.

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