Lots of doom and gloom in your post. And I agree with you that the idea of making snow across substancial sections of the arctic is just foolish on so many levels.
Even with a sea level rise of 150 feet vast sections of the earth will be above the sea. Human life will not end because coastal cities are no more.
Every post here today but one (the snow maker) talks about conservation or emission reduction. Where do all these posters get the idea that severe reduction is going to happen? I see no evidence of a budget being established, I see no evidence of the creation of a world body who will enforce these reductions if defined. I see no evidence that less pollution is not still more pollution added to what was emitted for the last 100 years. In short, doomsday is on the way.
So, instead of a pipe dream of hope, the world should think of ways so that more of our children will survive. If 5 Billion will die in the famine, war, and pestilence, what investment is justified in saving 20%, 1 billion people? I lament the mass extinctions across the globe, but how many species would you allow to die to save your own children?
Micro farming produces more per Sq meter, but vastly less for the markets nearly all of us shop in. It is time to consolidate ownership of high, flat farmland. Let professionals farm, good farmland is an asset of the world.
Improve infrastructure in developing nations, creating increased incomes and resulting in fewer children. Not just roads and bridges but government institutions especially the justice systems.
As the coastal cities flood, migration will be inevitable, we need to build high density planned communities starting today.
And so on...