Every six hundred thousand years or so Yellowstone blows a few hundred cubic miles of everything it can lift into the atmosphere and deconstructs everything in its path. The last time that happened was about 640,000 years ago. No amount of carbon offsets are going to do much about that mother of all cataclysmic farts.
Yellowstone National Park is a giant collapsed volcano, or a caldera from previous eruptions. Lately there has been a rash of small earthquakes and that may mean something imminent or something in another hundred thousand years or so, but the caldera still rises. Imagine that.
