IPCC Assessment Released: Climate Change 2013 (10346)
CO2 concentrations in the atmosphere are now unprecedented in at least the last 800,000 years, and they rise more than 100 times faster than during the past 20,000 years. This is caused by anthropogenic emissions of greenhouse gases by burning fossil fuels and land use change with consequent changes in the entire Earth System. The newest comprehensive assessment Climate Change 2013: The Physical Science Basis by the Intergovernmental Panel on Climate Change documents a rapidly and profoundly changing Earth System and provides the latest understanding of changes ahead of us. Over 2 Million Gigabytes of numerical data from climate model simulations permit an assessment of future changes whose magnitude and impact depend on our choices today. Cumulative carbon emissions determine the peak warming in the 21st century and serve as a tool to assess which climate targets are still achievable.