The answer to this question depends on the time frame, because the era of maximum fossil fuel burning coincides with a period of comparatively low volcanic activity. If you start, say, with 1950, I believe the answer is humans - if with 1500, volcanoes.
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The answer to this question depends on the time frame, because the era of maximum fossil fuel burning coincides with a period of comparatively low volcanic activity. If you start, say, with 1950, I believe the answer is humans - if with 1500, volcanoes.