fredag 27 september 2013

IPCC-rapporten publicerad - "Human influence on the climate system is clear"

Som nämnts tidigare på bloggen så har en av IPCC:s stora internationella arbetsgrupper befunnit sig i Stockholm denna vecka för att slutföra arbetet med en ny IPCC-rapport:
Climate Change 2013: The Physical Science Basis

En sammanfattning för beslutsfattare finns publicerad här.

Några budskap ur denna sammanfattning lyder:

- Human influence on the climate system is clear.

- It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th Century.

- Ocean warming dominates the increase in energy stored in the climate system, accounting formore than 90% of the energy accumulated between 1971 and 2010 (high confidence).

- Over the last two decades, the Greenland and Antarctic ice sheets have been losing mass,
glaciers have continued to shrink almost worldwide, and Arctic sea ice and Northern Hemisphere spring snow cover have continued to decrease in extent (high confidence)
- The rate of sea level rise since the mid-19th century has been larger than the mean rate during the previous two millennia (high confidence).

- The atmospheric concentrations of carbon dioxide (CO2), methane, and nitrous oxide have
increased to levels unprecedented in at least the last 800,000 years.

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