On the other hand, methane vents at the bottom of the Atlantic have probably existed since the Atlantic was formed and I expect for quite a few billion years in other oceans at other times. The idea that they came into existence the moment we discovered them and that therefore they must be caused or influenced by Man, specifically a few parts per million of a trace gas that's regularly recycled by the biosphere in huge quantities and has been for a billion years, is completely ridiculous.