Stephen,
I don't want to frighten you but the "Boffins" have seriously had this up their sleeves for some time. They say we aren't ready for it yet but if Global Warming gets out of hand they can fine tune the system with a touch of perpetual cloud which will reflect back the heat and save plants etc. on earth. The "only disadvantage" will be that blue skies will disappear forever. "They" say this will cause a great deal of depression and therefore is something to be avoided unless it becomes essential.
Cheers.
I once read a great deal of Bradbury.
Janet
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