On 27 Sep 2006, at 4:20AM, Dan Minette wrote:
1) Global Warming
Our understanding of global warming is still incomplete. We have not
verified our climactic models the way, for example, we have verified
numerical models that predict responses of electromagnetic
systems. The
various models have assumptions built in. Different models have
different
results because they are based on slightly different assumption sets.
'One degree and we're done for'
http://www.newscientist.com/article.ns?
id=mg19125713.300&feedId=online-news_rss20
""Further global warming of 1 °C defines a critical threshold. Beyond
that we will likely see changes that make Earth a different planet
than the one we know."
So says Jim Hansen, director of NASA's Goddard Institute for Space
Studies in New York. Hansen and colleagues have analysed global
temperature records and found that surface temperatures have been
increasing by an average of 0.2 °C every decade for the past 30
years. Warming is greatest in the high latitudes of the northern
hemisphere, particularly in the sub-Arctic boreal forests of Siberia
and North America. Here the melting of ice and snow is exposing
darker surfaces that absorb more sunlight and increase warming,
creating a positive feedback.
Earth is already as warm as at any time in the last 10,000 years, and
is within 1 °C of being its hottest for a million years, says
Hansen's team. Another decade of business-as-usual carbon emissions
will probably make it too late to prevent the ecosystems of the north
from triggering runaway climate change, the study concludes
(Proceedings of the National Academy of Sciences, vol 103, p 14288)."
[...]
--
William T Goodall
Mail : [EMAIL PROTECTED]
Web : http://www.wtgab.demon.co.uk
Blog : http://radio.weblogs.com/0111221/
Theists cannot be trusted as they believe that right and wrong are
the arbitrary proclamations of invisible demons.
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