"Whether there is an anthropogenic component is disputed."

Disputed by a tiny minority of contrarians who wish to be seen as standing out, people of the anti-science Nigel Lawson persuasion. There is consensus among those who are the true scientists in this field, more solid than for almost any issue in history. Of course, there are those who would rather like to be so conspicuously different, for their own reasons. I'll stand with the real science meself, not with oddball nutters who not only don't know what they're talking about but who are also irresponsible enough to suggest that everything's hunkydory. If the cap fits...