How the Big Green Challengers, Finalists and other groups can use photographs to tell their story and reach out to new audiences.
Social media allows people to create and disseminate their messages in their own way and on their own terms.
The web today can offer enormous possibility for supporting citizen-led action on social and environmental issues.
The Big Green Challenge is ot just about the groups and approaches that go on to win - it's as much about bringing people and their ideas together to showcase what is possible.
According to a poll carried out by NESTA, as many as 17 million people in Britain would be willing to work with others to combat global warming.
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