Technology is presented as the solution to environmental problems but wasn’t it technology that got us into this mess in the first place? This won’t sit well with the people trying to sell us green gadgets but we may have to change more than just our light bulbs. The environmental crisis we face is more than just a technological challenge. It is also a moral challenge. Most people on earth still belong to the world’s great religions. Could these huge collections of people hold the key to the widespread behaviour change needed to save civilization?