Volcanic eruptions, like fire, are easily proven to react with global warming. And, also like fire, they're known to cause it and be affected by it.

When one thinks about it, it's relatively obvious that volcanic eruptions can cause global warming; when volcanoes erupt, they release a number of unpleasant gases into the air, which can "trap" heat like biomass burning. But what's not as well-known is the fact that increased heat (caused by global warming) can also increase pressure, which, in turn, leads to more frequent eruptions. It also increases their severity. If this cycle gets out of hand, it could mean serious problems in the future.