Edit: in addition, there is often also the underlying assumption that if one proves that the majority of CO2 is not man-made, then it follows that man-made CO2 and global warming musn't be a real problem. But that assumes that the size of the contribution implies is ultimate significance: that's false.

One's food and mortgage payments generally dwarf other expenses yearly. That doesn't mean those expenses can't make or break your budget when tacked on. Since they are so small in comparison, they must be irrelevant, right?

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