Hmm: Richard Black claims a new study "throws emphasis back on CO2"

UC Davis study: Climate models may overstate carbon's influence - The Willits News

Unlike greenhouse gases, which can live in the atmosphere for centuries, black carbon particles have lifespans of only one to two weeks, making it more difficult to quantify their impacts on a global scale through direct measurements.

Twitter / enviroblack: Black carbon's role in #climate ...

Black carbon's role in #climate change over-estimated, study concludes http://bit.ly/PTBZIv  - throws emphasis back on CO2