Define "has not been a factor."
Does this mean anything above absolutely none?
-PJ
This challenge is an insidious game. . . to participate, to even attempt to prove the case, one has to accept the primary case. . . THAT GLOBULL WARMING IS EVEN OCCURRING REGARDLESS OF CAUSE! One must agree with a non-existent phenomenon.
This is a sensible as challenging people, for example, to prove that William Shakespeare did NOT ghost write Beethoven's Fifteenth Symphony for B flat Flugelhorns in F Sharp! Before you can even begin to prove the negative, you have to accept the positive asserted declaration of the truth that such a Flugelhorn symphony exists. (It doesn't.)