'We need some fire': climate change activists issue call to arms for voters

Campaigners say more than 15m people who care about the environment did not vote in the 2014 midterms - can they create a 'green wave' this November?

Among the motivating issues for voters in US elections, the environment is typically eclipsed by topics such as healthcare, the economy and guns. But the upcoming midterms could, belatedly, see a stirring of a slumbering green giant.

"The environmental movement doesn't have a persuasion problem, it has a turnout problem," said Nathaniel Stinnett, the founder of the Environmental Voter Project, which is aiming to spur people who care about the natural world and climate change to the ballot box. "This group has more power than it realizes. In the midterms we want to flood the zone with environmentalists."