Nuclear explosions inside supervolcanos could result in temporary volcanic winter and stop runaway global warming
The same could be done by large fires in forests in taiga in Siberia.
But injecting water in the upper stratosphere may be cheapest solution as it will result in small but reflective ice clouds.
It may be smaller volcano like Pinatubo or remote one.
But the main thing is urgency. If we have runaway global warming starting from methane release, any method is good.
Nuclear explosions inside supervolcanos could result in temporary volcanic winter and stop runaway global warming The same could be done by large fires in forests in taiga in Siberia.
But injecting water in the upper stratosphere may be cheapest solution as it will result in small but reflective ice clouds.
I doubt you could set off a supervolcano with such a method, but if you did, you would have a lot more to worry about than global warming.
It may be smaller volcano like Pinatubo or remote one. But the main thing is urgency. If we have runaway global warming starting from methane release, any method is good.