`  ==Human activity as primary cause vs. ``significant contributing factor``==  The intro said that 82% of scientists ``agreed with AGW``, apparently on the basis of a survey which asked them: :``Do you think human activity is a significant contributing factor in changing mean global temperatures?  My question to my fellow writers is whether agreeing that human activity is a ``significant contributing factor`` is the same as agreeing with AGW, i.e., the theory that most of the warming since (say) 1850 is due to human activity.  Are there any scientists who say make a distinction between ``significant`` and ``most``? (I think Richard Lindzen is one.) And if so, should we consider their ideas?   `