What would happen if two supervolcanoes erupted at once

I also meant to ask does anyone know if it's happened before?

Well just one caused a "year without a summer" here in the states.

Krakatoa I think

almost certainly, in the very distant past. our ancestors would have been slime, in deep water, probably

Tambora it was.

think of the earth as a marshmallow that has been toasted/melted on both sides and is having a hard time even clinging to the end of your stick

It was Tambora but thanks for replying.
Krakotoa was the loudest though.

I just wonder what it would do to the climate and for how many years?

That's a scary thought

Yah.....it was Tambora

All them South Pacific volcanoes look alike to us white american folk

you mean one isnt enough?

it would plunge the earth into a century long freeze. it would kill everything bar slime and bacteria

There is the Toba eruption and the theory about it. (from wiki)

The Toba supereruption was a supervolcanic eruption that is believed to have occurred sometime between 69,000 and 77,000 years ago at Lake Toba (Sumatra, Indonesia).
It is recognized as one of the Earth's largest known eruptions.
The related catastrophe hypothesis holds that this event plunged the planet into a 6-to-10-year volcanic winter and possibly an additional 1,000-year cooling episode. This change in temperature is hypothesized to have resulted in the world's human population being reduced to 10,000 or even a mere 1,000 breeding pairs, creating a bottleneck in human evolution.

Humans would go extinct.

It could easily be an ELE...without a doubt.

What happens if they nuke a volcano?

Don't know, but I don't think I'd want anyone to try it for fear that it would, rather than snuffing the eruption out, make it worse and the volcano would keep spewing radioactive crap into the atmosphere far longer & stronger than just an 'ordinary' nuke blast would.

Catgirls. Everywhere.