Re: [metatuning] Digest Number 675

Yes and No. A plausible theory is that a large glancing meteoritic impact shook
a blob of magma loose from the mantle-outer core boundary and that lead
secondarily to the Siberian lava flows. The direct evidence for an impact at the
P-T boundary is controversial with some labs finding clear evidence of
extraterrestrial material at the boundary and others not confirming this. As
both investigators are very competent (Luann Becker claims to find evidence),
the resolution is not clear.

Assuming there was only volcanism, it's not at all clear that the amount of CO2
being emitted is comparable to that of the Siberian traps or that the SO2 would
not counter the greenhouse effect by forming sulfate aerosols which reflect
sunlight back out to space.

The whole earth is in a natural warming trend which is a continuation of the end
of the ice age warming which began around 10,000 years ago (IIRC, not having
experienced it myself).

The science really isn't clear. Don't panic yet, but I agree that all of us,
including the Chinese, whose economy is based on coal instead of oil, should try
to limit greenhouse emissions. The problem is the enormous cost of doing so and
the lack of politically or economically acceptable alternatives to fossil fuel.
Nuclear power has its own problems, the so-called hydrogen economy is
chimaerical as not only are hydrogen leaks a direct threat to the ozone layer,
one needs a lot of power to generate the hydrogen in the first place and fossil
fuel is the preferred choice. Solar power only works in some areas and it's not
clear that it is economical given the cost of making the silicon or other
semiconductors for the solar panels. At the moment it's being subsidized by some
governments. Wind power works in some areas, as does geothermal, but the main
problem is the small amount available and the difficulties of transporting to
population centers.

--John

along these lines . i have also enjoyed the theories of one russian scientist who
has work with solar system magnatism. a link is here
http://tmgnow.com/repository/global/planetophysical1.html . obviously there is more
than one way for such things to happen

John Chalmers wrote:

> Yes and No. A plausible theory is that a large glancing meteoritic impact shook
> a blob of magma loose from the mantle-outer core boundary and that lead
> secondarily to the Siberian lava flows. The direct evidence for an impact at the
> P-T boundary is controversial with some labs finding clear evidence of
> extraterrestrial material at the boundary and others not confirming this. As
> both investigators are very competent (Luann Becker claims to find evidence),
> the resolution is not clear.
>
> Assuming there was only volcanism, it's not at all clear that the amount of CO2
> being emitted is comparable to that of the Siberian traps or that the SO2 would
> not counter the greenhouse effect by forming sulfate aerosols which reflect
> sunlight back out to space.
>
> The whole earth is in a natural warming trend which is a continuation of the end
> of the ice age warming which began around 10,000 years ago (IIRC, not having
> experienced it myself).
>
> The science really isn't clear. Don't panic yet, but I agree that all of us,
> including the Chinese, whose economy is based on coal instead of oil, should try
> to limit greenhouse emissions. The problem is the enormous cost of doing so and
> the lack of politically or economically acceptable alternatives to fossil fuel.
> Nuclear power has its own problems, the so-called hydrogen economy is
> chimaerical as not only are hydrogen leaks a direct threat to the ozone layer,
> one needs a lot of power to generate the hydrogen in the first place and fossil
> fuel is the preferred choice. Solar power only works in some areas and it's not
> clear that it is economical given the cost of making the silicon or other
> semiconductors for the solar panels. At the moment it's being subsidized by some
> governments. Wind power works in some areas, as does geothermal, but the main
> problem is the small amount available and the difficulties of transporting to
> population centers.
>
> --John
>
>
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