torsdag 20. januar 2011

Nettips I: Ny klimaartikkel fra James Hansen

James Hansen har lagt ut en artikkel (fortsatt åpen for revisjon) med tittelen "Paleoclimate implications for human-made climate change", skrevet av ham selv samt Makiko Sato (25 s., PDF).

Utdrag fra abstract:

We conclude that Earth in the warmest interglacial periods was less than 1°C warmer than in the Holocene and that goals of limiting human-made warming to 2°C and CO2 to 450 ppm are prescriptions for disaster.
If warming reaches a level that forces deglaciation, the rate of sea level rise will depend on the doubling time for ice sheet mass loss. Gravity satellite data, although too brief to be conclusive, are consistent with a doubling time of 10 years or less, implying the possibility of multi-meter sea level rise this century. The emerging shift to accelerating ice sheet mass loss supports our conclusion that Earth's temperature has returned to at least the Holocene maximum. Rapid reduction of fossil fuel emissions is required for humanity to succeed in preserving a planet resembling the one on which civilization developed.

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