Climate Change 2007: Synthesis Report. Contribution of Working Groups I, II and III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (10 min)

  • Read pages 30-33, sections 1.1 (Observations of climate change) and 1.2 (Observed effects of climate changes) to understand the evidence for observed effects of climate change including temperature as well as the effect on snow, ice, and sea levels. It is important to distinguish varying levels of statistical certainty (high confidence, medium confidence, likelihood) about the evidence for climate changes and their effects.