Yep, water is the main greenhouse gas in the Earth's atmosphere
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I find it quite amazing Steve how very few people know about this. While it is the great balancer, removing huge amounts of CO2 from the atmoshphere, at the same time creating it's own overheating problems.
I just watched today's Sky Watch segment by resident suit-n-tie "astronomer" Glen Nagle (almost a Nagler!), who referred to the Beehive M44 as a globular cluster.
I love the idea of dehydrating the water - that seems the answer. And just to help it along, if we go all out for nuclear energy, we can convert what's left into heavy water which won't be able to lift off the ground into the atmosphere.