Re: BBC Sci/Tech

On Apr 21, 4:57 pm, Telamon
<telamon_spamshi...@xxxxxxxxxxxxxxxxxxxxxx> wrote:
In article <mllk23hqhd4bo0ifkc613rguvn9h00v...@xxxxxxx>,



helmsman <helms...@xxxxxxxxxxxxxxxx> wrote:
Stolen in total from another NG. No cite.
********************************** BBC Sci/Tech

Global warming - is the Sun to blame?

More research is called for to determine the Sun's effect on climate
change

By BBC News Online Science Editor Dr David Whitehouse

Global warming may not be caused by humanity's fossil fuel emissions,
but could be due to changes in the Sun.

Research suggests that the magnetic flux from the Sun more than
doubled this century. As solar magnetism is closely linked with
sunspot activity and the strength of sunlight reaching Earth, the
increase could have produced warming in the global climate.

Solar Wind

This magnetic field is caused by the Solar Wind, a stream of
particles given off by the Sun which fills the solar system.

Evidence from before the space age suggests that the magnetic field
is 2.3 times stronger than it was in 1901.

Scientists do not doubt that the increased magnetic field results
from a more energetic Sun. Their problem is that the effect of these
increases on the Earth is unknown.

It is known that depending on the situation, such as magnetic reversals,
the energy is dumped into the earths atmosphere eventually turning into
heat.



Not our fault?

The research ispublished in Nature and in the same journal Professor
Eugene Parker, of the Laboratory for Astrophysics and Space Research,
University of Chicago, comments that it could explain global warming.

He notes that the increased solar activity has occurred in parallel
with an increase in carbon dioxide in the Earth's atmosphere. And it
may not be a coincidence, he says.

Professor Parker suggests that the Sun's increased activity caused
the Earth's global temperature to rise and that in turn warmed the
oceans.

Warmer oceans absorb less carbon dioxide from the atmosphere. So a
warmer Earth has more of the so-called greenhouse gases. Humanity's
burning of fossil fuels may therefore not be the cause of global
warming.

Perilous plans

Professor Parker adds that that more research must be done about the
Sun's role in global warming before drastic action is taken here on
Earth.

"It is essential to check to what extent the facts support these
conclusions before embarking on drastic, perilous and perhaps
misguided plans for global action," he says.

Measurements of the magnetic field are not the only evidence for the
Sun's variable influence on the Earth. The planet went through a
"little ice age" during the 17th Century, at a time when very few
sunspots appeared on the surface of the Sun.

And the so-called "medieval maximum" was a period of warmer than
average global weather in the 12th Century. Astronomers believe that
the Sun was slightly brighter at that time.

All we to have happen is one large volcanic event and global
temperatures will decrease for years at a time.

--
Telamon
Ventura, California

- BUT..

Because of the greenhouse gases added to the atmosphere by mans
activities..

and their heat trapping properties..

( as well as the deforestation of huge areas of the earths surface )

a volcanic eruption, and ensuing dust cloud in the upper atmosphere

- Won't cool the atmosphere as much as it would

without the addition of the green house gases directly linked to mans
activities . . .


Right?

and then, there's this . .


http://www.newyorker.com/fact/content/?050425fa_fact3












.

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