Just a brainstormy late-night idea --
The air above the arctic and southern oceans is colder than the water,
especially during the long winter night. It is possible in principle
(although probably not practical) to extract energy from this
temperature difference, by putting a heat exchanger in the air and
another in the water, and running a heat engine on the heat flux from
water to air. If it did turn out to be feasible, it would be an
energy source that cools the planet -- directly by putting heat where
it will be radiated to space sooner, indirectly by increasing sea ice
coverage, and maybe indirectly again by increasing upward heat
transport through the atmosphere.
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