| Forskning - Isfri Arktis om sommeren, ikke hvis..21-03-2007 07:25 | |
| rick_uk★★★★☆ (1140) |
Isfri Arktis om sommeren, ikke hvis men hvornår. 'Arctic Sea Ice Melt May Set Off Climate Change Cascade' (19/3): http://www.ens-newswire.com/ens/mar2007/2007-03-19-06.asp 'Arctic sea ice that has been shrinking for decades may have reached a tipping point that could trigger a cascade of climate changes reaching Earth's temperate regions, finds a new study from the University of Colorado at Boulder. Dr. Mark Serreze, a senior research scientist at CU-Boulder's National Snow and Ice Data Center...said Arctic sea ice extent has been decreasing in every month since 1979, when satellite recordkeeping began....Serreze and his team attributed the loss of ice, about 38,000 square miles annually as measured each September, to rising concentrations of greenhouse gases and strong natural variability in Arctic sea ice. Serreze: "When the ice thins to a vulnerable state, the bottom will drop out and we may quickly move into a new, seasonally ice-free state of the Arctic. I think there is some evidence that we may have reached that tipping point, and the impacts will not be confined to the Arctic region." "Given the growing agreement between models and observations, a transition to a seasonally ice-free Arctic Ocean as the system warms seems increasingly certain. The unresolved questions regard when this new Arctic state will be realized, how rapid the transition will be, and what will be the impacts of this new state on the Arctic and the rest of the globe," the researchers wrote in "Science." "We have already witnessed major losses in sea ice, but our research suggests that the decrease over the next few decades could be far more dramatic than anything that has happened so far. These changes are surprisingly rapid." said Dr. Marika Holland of the National Center for Atmospheric Research. Another 'brick in the wall' of Arctic research... Vh rick Vi har hørt varslerne. Klokken tikker....Informerede valg. |
| 21-03-2007 10:58 | |
| manse42★★★☆☆ (633) |
Stammende fra den generation betyder "brick in the wall" at man blokerer for andre indflydelser, og kun lytter til det der bliver beordret MX amatør Hypotesen om menneskeskabt global opvarmning er et menneskeskabt problem |
| 21-03-2007 21:00 | |
| rick_uk★★★★☆ (1140) |
Another bri(c)k i puslespillet Vh rick Vi har hørt varslerne. Klokken tikker....Informerede valg. |
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