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If this makes sense shooting water as snow over either pole would do better.
Consider how much power would need to be used to move enough water high enough to seriously effect the atmosphere. What this idea really needs is a tropical island with a tall mountain where the stack pumps the water up to the top. Then use the tidal changes to power it. Anyone know of an island that would volunteer?
The catamaran looks nice as an illustration but it's too top heavy. The slightest blow would flip it over.