"Fran" <Fran.Beta@[EMAIL PROTECTED]
> wrote in message
news:148a8b14-3e92-4783-8394-7cedd810a33f@[EMAIL PROTECTED]
Apr 11, 12:01 am, Tunderbar <tdcom...@[EMAIL PROTECTED]
> wrote:
It's a common place for those of the GPC lobby to wave their hands in
the direction of Paleozoic history and say things like 'climate
changes have marked the history of the Earth' and 'the current
atmosphere is, in geological terms, CO2-poor' and 'temperatures have
been much hotter than this in the distant past'. They want of course
to sound well informed, and to make the current changes seem
relatively insignificant.
******************
The changes in CO2 levels over the last 150 years ARE relatively
insignificant,
and we're not even sure they're anthropogenic!
They have had virtually no effect on global temperatures.
Global temperatures were warmer during the
Mediaeval Warm Period and cooler during the e.g. Maunder Minimum.
All natural variability due to solar influences.
*********************
a) At what point do rising CO2 concentrations become a problem? A
related question would be: at what moment before that point is reached
would human intervention be compelled to stop it reaching that point?
**********************
CO2 levels are nowhere near being a problem and will probably never be
in the foreseeable future.
We are not even sure that the insigificant rise of CO2 over the last 150
years is anthropogenic.
We have no control over CO2 levels in the atmosphere.
It might even be a totally natural variation.
*******************************
b) At what point do mean near surface temperatures become a problem?
*********************************
Mean near surface temperatures could become a problem in the unlikely
event they rise significantly.
In the current global cooling environment, this possibility is becoming
more remote by the day.
**************************
c) Bearing in mind that something like 60-70% of us humans live within
80 km of the sea coast, at what point would rising sea-levels be a
problem? At what point before further deglaciation occurs must
humans intervene to prevent it?
*************************************
Sea levels are not rising significantly and any "deglaciation"
is part of natural variability and appears to be about to reverse.
--
Warnest Regards
Bonzo
"There is a clear attempt to establish truth not by scientific methods
but by perpetual repetition." Richard S. Lindzen, Ph.D. Professor of
Meteorology, MIT
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