That is absurd. From what I've read about the supposed Global Warming, the average temps have gone up about 0.5°C or so and that is "melting magma"? Isn't magma already melted, as in molten lava? A quick internet search told me that the temperatures of most magma are 600°C to 1300°C. So, we carbon based lifeforms are "melting magma" by driving SUVs and using incandescent light bulbs??? Yeah, sure we are.
If a volcano is going to blow, a glacier won't stop it for more than 15 minutes.
Idiocy...we're so screwed.