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The estimate that volcanic emissions are 1% of human emissions would have to be off by a factor of 100 to even equal let alone outstrip them. Do you really think vulcanologists are that clueless?

They really do know where most of the underwater volcanoes are located, along the mid-Atlantic rift and other rift zones around the world. There's a new Hawaiian island forming south of the Big Island that will break the surface in 5,000-10,000 years. Any major underwater volcanic activity is likely to produce enough effects that we'll notice it sooner or later.