Climate change: The current state of knowledge

Th e scientifi c evidence on climate change and its impacts is compelling and continues to evolve. Th e Fourth Assessment Report by the Intergovernmental Panel on Climate Change (IPCC 2007a) states that our planet’s climate is indisputably warming, and the Stern Review (2006) on the economics of climate change concludes that climate change presents very serious global risks and demands an urgent global response.