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"Alastair McDonald" <alastair@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> skrev
i en meddelelse news:dtvki0$kh1$1@xxxxxxxxxxxxxxxxxxxxxxx
>
> "Carsten Troelsgaard" <carstenNOSPAM.troelsgaard@xxxxxxx> wrote in message
> news:44032b08$0$47077$edfadb0f@xxxxxxxxxxxxxxxxxxxxxxx
>
>> Thank you for the articles. If anything has made me move my opinion on
>> global changes, it's another branch of environmental science: The
>> population
>> of East-Greenland are the ones that suffers most (has acumulated the
>> highest
>> amounts) from the spread of PCB and the rest of "The dirty dozen". It's
>> staggering how the stuff concentrates in the most unlikely places.
>> http://www.mst.dk/udgiv/publications/2001/87-7944-977-8/html/kap09_eng.htm
>>
>> You know my take as a geologist on global climate changes - it happens
>> through time. ...
>
> And so do mass extinctions!
We do a pretty good job at that allready, so if climate returned to 'normal'
even now, we can be sure to have left our 'extinction-event' in the annals
> Admittedly no climate changes in the past, and
> no mass extinctions have been cause by man, but that is simple to explain.
> Man wasn't there at the time.
>
> The Snowball Earths, first in the Achaean and then later in the
> Neoproterozoic, were almost certainly caused by biota reducing the
> amount of greenhouse gases, such as carbon dioxide, in the atmosphere.
> The Sun is now 30% stronger than it was when in the Hadean and we are
> INCREASING the amount of greenhouse gases. We are also biota, and we
> could also trigger a climatic catastrophe.
> The warming from increased
> carbon dioxide could well cause a release of methane hydrates such as
> happened during the Palaeocene-Eocene Thermal Maximum.
Have you got a source for the methane hydrate thing?
I've had a look at a giant landslide 'Storeggan', taking off on the
Norwegian shelf and slushing up on the shores of the British Isls. It's
thought to have come by a methane hydrate release. The only way I can figure
out how, is as a result of pressure-release from overburden water
disappearing onto the continent as ice (low sealevel) and perhaps
lithospheric lifinng as a peripheral bulge. And I always looked at it as a
possible reason for an abrupt end to an ice-age ... not a consequence of a
warm climate.
> As a geologist, no doubt you were educated in the gradualist tradition
> of Uniformitarianism.
Naa, I started out with Velicovsky
> But that sort of thinking belongs to the
> Victorian Age of the nineteenth century. We now know that ice ages
> happened and meteorites struck the Earth from outer space. The land,
> covered with green vegetation, tends to hide the scars that can be
> clearly seen in desert regions and testify to the violent history
> of the Earth!
>
>> ... I can't help smiling by the thought of raising my voice
>> toward US, China and who know where and how many billions of educated or
>> uneducated people ... the wheels are rolling and we just love it.
>> As a measure of precaution we should be careful, sure ... ;o)
>
> Pride comes before a fall, and the peak is just before the crash.
>
>> I've had a couple of takes on converting some to switch a belief in a
>> 6000
>> year old to a 4.5 bill y old earth - - - as if it wasn't reasonably
>> clear
>> compared to climate evolution - - it doesn't encourage me to anything,
>> except perhaps to invest in rubber-boots.
>> In my neighbourhood it's sort of partly been taken care of due to
>> pricing-politics - for a long time there's been a lot of money to be made
>> by
>> reducing consumption of energy.
>
> Never mind trying to convert the few creationists. The real problem is
> the hosts of intelligent people who are being told that GW is a problem
> for the next millennium, or perhaps for their grandchildren to solve. The
> world is not going to rapidly cool because of global warming. We can
> expect a rapid and sudden warming which will destroy agriculture. Welly
> boots will not save you from that. They are not edible.
Sorry Alastair, there's something you've got wrong. The ice-cores shows an
abrubt end to ice-ages. You tend to forget that we'r not currently in an
ice-age, so whatever the feed-back of a quick ice-melt as it's seen in the
cores, it's not working now. Or would you prefer that I write probably not
working now. The loss of sea-ice has an influence on albedo .. I wonder
weather anyone has been calculating on this part.
But it looks like a wake-up call for a reality of the climate-problem.
Carsten
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