(BBC) - Perched on sea-ice off Canada's northern coast, parka-clad scientists watch saltwater pump out over the frozen ocean.
Their goal? To slow global warming.
As sea-ice vanishes, the dark ocean surface can absorb more of the Sun's energy, which accelerates warming. So the researchers want to thicken it to stop it melting away.
Welcome to the wackier side of geoengineering - deliberately intervening in the Earth's climate system to try to counteract the damage we have done to it.
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