Let me put this in simpler terms so you stupid anti-climate chang, white supremacists will understand.
1# ERUPTION - 800km around the Yellowstone national park IS GONE in lava. A caldera with this size breaks open, everything in this radius falls down into several kilometers deep of lava. I quote a scientist "we are toast, we are done". It's just ..... gone, not there anymore.
2# Whole America would be buried under several meters of extremly toxic volcanic ash and it all will be made of billions + billions of microscopic pieces of glass(stone explodes = splitters, the heat melts this creates glass), they found a herd of dead animals ~1000km from Yellowstone from the last eruption and all had the glass ash in their bones, killed by the ash rain which got into their lungs.
3# The ash would rain over North America for weeks, crushing houses under the weight and burrying everything beneath. Without a gas mask - see 2
4# The ash comes into the stratosphere, travels around the world and if it comes into contact with airplanes the turbines are "glased" because the ash melts again because of the temperature there = drop dead to the ground.
That's why the worldwide air travel has to stop for several months, maybe a year, nothing can fly.
5# The ash clouds darken the sky for 5-6 years, every plant dies. So does every animal because they have no food without the plants. Also, nuclear winter, global temperatures drop about ~10-15 degree celsius.
#6 WE ARE FUCKED. Seriously, if this thing breaks out ...... I don't think the human race can survive.
7# Did I mention that the Yellowstone volcano breaks out in intervals (out of my head every 1,35 million years as far as I remember) and it's overdue? Okay we talk about a timespan of (out of my head, don't have the presentation here) 0-50.000 years, but I could break out every moment