A group of environmentalists across the world believe that, in order to save the planet, humanity must embrace the very science and technology they once so stridently opposed. In this film, these life-long die-hard greens advocate radical solutions to climate change, which include GM crops and nuclear energy. They argue that by clinging to an ideology formed more than 40 years ago, the traditional green lobby has failed in its aims and is ultimately harming its own environmental cause. As author and environmentalist Mark Lynas says, 'Being an environmentalist was part of my identity and most of my friends were environmentalists. We were involved in the whole movement together. It took me years to actually begin to question those core, cherished beliefs. It was so challenging it was almost like going over to the dark side. It was a like a horrible dark secret you couldn't share with anyone.