You mean someone finally paid attention to their high school chemistry class?

Don't forgot Pinatubo, which set climate change back several years and was the cause of that nasty cooling dip everyone on both sides was creaming their pants about awhile back.

Second sentence of the article in question, published in Science, emphasis mine:

"Here, we show that this acted to slow the rate of increase in global surface temperature over 2000 to 2009 by about 25% compared to that which would have occurred due only to carbon dioxide and other greenhouse gases."

Hint: Susan Solomon is not saying greenhouse factors (don't exist/are backward/are a product of the lizard people/algore is fat/etc.). She's discussing some variability in stratospheric water vapor of unknown attribution (which she observes as being in the opposite direction the previous decade, so it's not a clear negative feedback response, either) either blunting or worsening the steadier trend of increasing greenhouse forcings.

The lead author of this study, speaking this week to the New York Times:

"Despite the decrease in water vapor, the study's authors said, the overall trend is still toward a warming climate, primarily caused by a buildup in emissions of carbon dioxide and other heat-trapping gases from human sources.

"This doesn't alter the fundamental conclusion that the world has warmed and that most of that warming has to do with greenhouse gas emissions caused by man," said Susan Solomon, a climate scientist at the National Oceanic and Atmospheric Administration and the lead author of the report, which appears in the Jan. 29 issue of the journal Science."