Published online by Cambridge University Press: 04 January 2013
Climate change represents one of our greatest public policy challenges. A broad, well-established and international scientific consensus exists that our planet is undergoing climate change. The question is not whether there is climate change, but how best to respond to it. Climate change is a global phenomenon that requires a global effort unlike anything previously attempted. This global challenge is complicated by related and more controversial questions about causal responsibility. Although convincing evidence shows that climate change is a result of human behavior, much less agreement exists on how this should factor into policy.