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Which do you think would be most cost efficient. 1) Creating a reflective dust cloud round the Earth 2) Placing some kind of umbrella in orbit round the Earth 3) Placing a much smaller umbrella at the stable point between the Earth and Sun. Option 1 would probably continuously need topping up. Option 2 would need to surround the whole Earth to give an effective shield with only that on the Sun facing side working at one time. Rather a hazzard to space flight as well. Option 3 would need more fuel to place in position, but would be much smaller thus might be more efficient. Rand Simberg wrote: On Sun, 26 Jun 2005 22:09:11 GMT, in a place far, far away, lid (John Savard) made the phosphor on my monitor glow in such a way as to indicate that: Why, yes, there are. We _can_ tread more gently on the Earth without attempting to curtail human material well-being to an unrealistic extent. There are other ways to produce energy besides the use of fossil fuels. Yes, and as the cost of fossil fuels rises, we will continue to shift over to them more and more. |
#12
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wrote in message
ups.com... Which do you think would be most cost efficient. 1) Creating a reflective dust cloud round the Earth 2) Placing some kind of umbrella in orbit round the Earth 3) Placing a much smaller umbrella at the stable point between the Earth and Sun. Option 1 would probably continuously need topping up. Option one will be many orders of magnitude more cost effective. If memory serves the average life expectancy of such dust in the atmosphere is around three years. This should enable fairly responsive regulation of dust levels. Perhaps a dozen 747s continuously ferrying dust to altitude might be sufficient, (highly dependent on assumptions, particularly average particle size). A cross the board jet fuel dust additive might be more easily made to happen, it might only be a few percent of such fuel by mass. Fly back artillery systems, high mountains and towers, thermals from power stations, jet streams, etcetera, might also bring the cost down dramatically. The type of dust might also be selected for specific wave lengths - reduced UV might greatly reduce cancer rates. A nuclear winter is the quick fix to global warming, and it would only take one nuclear power to get desperate. Lets say global warming does get bad and result in global depression, this would quite likely result in at least a little nuclear war as people naturally start fighting over fewer resources. So global warming will be "naturally" counter acted. :-) Pete. |
#13
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wrote in message
ups.com... Which do you think would be most cost efficient. 1) Creating a reflective dust cloud round the Earth 2) Placing some kind of umbrella in orbit round the Earth 3) Placing a much smaller umbrella at the stable point between the Earth and Sun. You left off option 4: 4) Use the space infrastructure you'd need to build giant sunshields in space to instead build Solar Power Satellites. The SPS would speed the retirement of fossil-fueled power plants, thus doing more to combat global warming than would anything merely providing a bit of shade. But if limited to your 3 choices, I'd pick 2. I hear you that it's less than efficient in that the shades are not always between you and the sun, but the L-1 sunshade is also less than efficient in that the penumbra is several times the size of the Earth by the time it gets here, meaning much of the shadow is wasted, so to speak. -- Regards, Mike Combs ---------------------------------------------------------------------- Member of the National Non-sequitur Society. We may not make much sense, but we do like pizza. |
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