Cities will be key to a low carbon, resilient global economy able to address and adapt to climate change. Many are emerging as leaders cutting emissions and greening infrastructure. Photo ©Pline
A new grassroots movement has launched petitions in hundreds of cities across the world calling for a transition to 100 percent renewable energy/zero emissions by 2050 at the latest. While this may have sounded like wishful thinking a few short years ago, these activists are actually building on a growing number of communities that have already taken such pledges — and some who appear to have achieved them. Find out which cities.