>>11599341No, we couldn't even match a supervolcano explosion.
China and Us have about equal megatonnage in terms of nukes (chinese nukes are much bigger) around 450mt vs 550mt for US. Throw Russia into the mix, which has around 800mt. The rest are negligible.
Anyway combine all the thousands of existing nukes, and you get a 1-2 gigaton explosion.
For reference supervolcanos are in the teraton range.