[Southack]

"LIVERMORE, Calif. -- Researchers at the Lawrence Livermore National Laboratory have discovered another fingerprint of human effects on global climate."

No, all that the researchers have done is show a change.

They haven't shown that the change was EITHER natural or manmade.

Thus, the entire premise of the article is unfounded.

[cogitator]

The change is observed. The implication of human activities is done via comparisons to models (two different ones, according to the article).