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The onus is on the person making the claim to bring evidence to the discussion.

"What can be asserted without evidence can be dismissd without evidence" -- C. Hitchens

Since the comment was removed or deleted it originally said something like "Underwater volcanoes are the cause of Climate Change -- prove me wrong"

Since the question has been asked, I found this to be relatively convincing to the casual observer:

Perhaps the only thing more absurd that original is censoring it and removing it.

It's not removed. Turn "showdead" on in your profile.

Low quality comments are removed when flagged by enough people. It's actually a good thing.