“The molten carbon lake sits beneath the Yellowstone National Park, which in and of itself is a super volcano with the power of a massive eruption. The last major eruption was 640,000 years ago at Yellowstone, however if the super volcano did erupt it could cause the US to go into a nuclear winter. The eruption, when it does occur, would be on the order of 1,000 times more powerful than the 1980’s Mount St. Helens eruption.
In part due to this research, scientists now believe the Earth’s upper mantle may hold up to 100 trillion metric tons of carbon. To put this into perspective, the US EPA estimated that in total 10 billion metric tons of carbon was emitted in 2011, or approximately 0.01% of the carbon sitting in Earth’s mantle.”