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"Although scientists do not fully understand why glaciers appear to weaken volcanic eruptions, they believe the mechanics may be fairly straightforward. When glaciers expand, all that ice puts immense pressure on Earth’s surface. “It can affect magma flow and the voids and gaps in the Earth where magma flows to the surface as well as how much magma the crust can actually hold,” Swindles says. When glaciers retreat, the pressure lifts and volcanic activity surges. “After glaciers are removed the surface pressure decreases, and the magmas more easily propagate to the surface and thus erupt,” Swindles wrote in an e-mail to Scientific American."
"As for greenhouse gases, underwater and land-based volcanoes are estimated to release, in total, around 100–300 million tonnes of CO2 each year, according to the British Geological Survey and the US Geological Survey. That's a large quantity, but only around 1% of the amount that humans release from burning fossil fuel alone."