rapido scioglimento dei ghiacci in atto
- Subject: rapido scioglimento dei ghiacci in atto
- From: "Alessandro Gimona" <agimona at hotmail.com>
- Date: Thu, 09 Mar 2000 10:11:37 GMT
Notizia climatica, alquanto allarmante
Polar meltdown's terrifying
Washington: Melting is taking place on a vast and
unprecedented level in the Arctic sea ice, the
Antarctic and in dozens of mountain and
sub-polar glaciers, and the rate has accelerated
tremendously in the past decade, a US
environmental watchdog group has reported.
The Worldwatch Institute in Washington says the
shrinkage of the Earth's ice cover could have
profound changes on the global climate, and
rising sea levels could spark regional flooding.
Melting of mountain glaciers could also threaten
urban water supplies and the habitats of plant and
animal species in fragile environments, the report
The melting has been particularly noticeable in the
past three decades, and scientists suspect it is the
result of human behaviour and the build-up of
carbon dioxide and other greenhouse gases.
The Antarctic ice cover, which averages 2.3
kilometres thick and represents 91 per cent of
the world's ice, is also melting. Ice to the west of
the Antarctic Peninsula decreased by some 20
per cent between 1973 and 1993.
The main front of New Zealand's Tasman Glacier
has retreated 1.5 kilometres since 1982, the
The Arctic sea ice has shrunk by 6 per cent since
1978, with a 14 per cent loss of the thickest
year-round ice. The average thickness has
dropped from 3.1 metres to 1.8 metres - a
decline of nearly 40 per cent in the past three
The Greenland Ice Sheet, which comprises 8 per
cent of the world's ice, has thinned by more than
a metre per year on average since 1993 on its
southern and eastern edges.
The world's mountain glaciers are now shrinking
faster than they are growing. Scientists predict
that a quarter of global mountain glacier mass
could disappear by 2050.
Within the next 35 years, the Himalayan glacial
area is expected to shrink by one-fifth, to just
In Glacier National Park, in the US Rocky
Mountains, the number of glaciers has dropped
from 150 to fewer than 50, Worldwatch says.
The report predicts that the remaining glaciers
could disappear in 30 years.
Get Your Private, Free Email at http://www.hotmail.com