New IPCC assessment report: Improved models, more accurate statements

With the help of MPI-BGC authors, the first part of the fifth assessment report (AR5) on the world climate has been released by the Intergovernmental Panel on Climate Change, IPCC. Co-Author of the report and scientific contact at MPI-BGC is Max Planck director Prof. Martin Heimann.

The report of working group I provides a comprehensive assessment of the physical science basis of climate change. It was compiled by a total of 209 Lead Authors and 50 Review Editors from 39 countries and more than 600 Contributing Authors from 32 countries.

Warming of the climate system is unequivocal. The atmosphere and ocean have warmed, the amounts of snow and ice have diminished, sea level has risen, and the concentrations of greenhouse gases have increased.
Human influence on the climate system is clear. This is evident from the increasing greenhouse gas concentrations in the atmosphere, positive radiative forcing, observed warming, and understanding of the climate system.