XKCD covered this, it turns out any method of bringing enough ice into Earth's gravity well will release more energy than it will ever cool the planet down by. (In fact simply harvesting the energy of slowly lowering it down would lower emissions and planetary heating far more).
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Greenland's way ahead of them.
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Like 'the' Futurama bit. That's literally the in universe solution that they came up with, big block of ice in ocean every year.
And that’s why Futurama’s America has the Sunken City of Atlanta, Georgia
XKCD covered this, it turns out any method of bringing enough ice into Earth's gravity well will release more energy than it will ever cool the planet down by. (In fact simply harvesting the energy of slowly lowering it down would lower emissions and planetary heating far more).