Re: How to Cool a Planet (far fetched ideas)

I have always been in favour of large rotating mirrors placed at the L1
stable point between the Earth and the Sun.
I would guess that large sheets of aluminium coated mylar could do the
job. Rotation holds them in shape.
We are talking about very large area here to have a noticable effect.
Probably equivalent to 1000km diameter (although several smaller
mirrors of the same area would probably be used).

To launch such a mass which is still going to be 1000 tonnes the space
elevator would be ideal, if we can solve the problems of its
construction such as very high strength to weight cable (most likely
some kind of carbon nanotube).

simple_language@xxxxxxxxx wrote:
Paul F. Dietz wrote:

The optimized scatters proposed by Wood and Teller
would likely be harder to fabricate, but the mass
savings is enormous (two or three orders of magnitude).
Moreover, small angle scattering makes the light pressure
problem much easier to deal with, since the impulse
delivered to the scatter goes as theta^2 for small
theta.

I have just found their article at:
http://www.rense.com/general18/scatteringEdTellerwithnotes.pdf

They reviewed many contraptions including
organic dyes and balloons. They also mention
differential cooling and heating, which could
theoretically create temperate, wet climate
all over the earth and it could reduce diurnal
and seasonal temperature variability.

simple_language@xxxxxxxxx wrote:

My favorite idea is a thin mirror placed close to the sun
that is reflective on the sunny side and black on the
dark side.

Paul F. Dietz wrote:

If it is close to the sun it will have negligible effect
on Earth. It needs to be much closer to the Earth than
it is to the Sun.

Good point!

My intuition tells me that multipurpose
systems are the best ones. An airborne wind
turbine generator (http://www.skywindpower.com)
can lift light reflecting *** that alters
the climate. Such turbine generator is most
practicable around 40 degrees latitude
because the strongest jet streams are there:
http://www.skywindpower.com/ww/page010.htm.

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