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RE: A proposed solution to Global Warming?
I know you said source and not cause, but I said it just in case.
Yes, water vapor is the main source of greenhouse effect. The more the temperatures rise, the more the amount of water vapor rise, creating a positive feedback as well as ice melting.
Assuming that aluminum particles can be launched outside the atmosphere, how can direct them to L1 point? How can we ensure it does not hit any satellite or space junk?
Easy.
Launch them in a container programmed to discharge them when it reaches the L1 point. They'd be scattered into a lens/umbrella naturally by the balancing effect between the Earth and Sun's gravity-pull.
Same for the ball-bearings.
We KNOW how to plan launches to Mars, so L1 should be a breeze. Launch them in a semi-circular orbit that gets them to L1 with low orbital energy left(orbital mechanics, physics). They'll be trapped there by the same balance that IS the L1.
No problemo.
I sorta lean towards the ball-bearing solution because the aluminum solution would require ongoing rocket launches(more expensive) whereas the ball-bearing rail-gun, once built, would just face energy and ball-bearing manufacture costs. The rail-gun could not use aluminum.
Also, be careful of your language....water vapor is not the SOURCE of Global Warming either, it's the major CAUSE of GW!
And, YES, it may be human-caused.
I'm not arguing CAUSE, or DENYING GW, I'm presenting a possible SOLUTION.
The Paris Accord....is NOT A SOLUTION.