Left-wing journalist Revkin sees lots of evidence that CO2 is a substantial climate driver, but not clouds

A Reality Check on Clouds and Climate - NYTimes.com

There’s a long history of assertions that clouds can be a substantial driver of climate change, distinct from their clear potential to amplify or blunt (depending on the type of cloud) a change set in motion by some other force. But there’s still scant evidence to back up such assertions.
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As always happens after such episodes, the one clear finding is that clouds remain a complicating component in efforts to project warming from the building greenhouse effect.

Joni Mitchell’s classic, with a bit of mangling, sums things up well:

They’ve looked at clouds from all sides now, as feedback and forcing, and still somehow, it’s clouds’ illusions most often recalled. More work is needed to know clouds at all.

April 2011: Tom Nelson

YouTube - Joni Mitchell - Both Sides Now (Live, 1970)

[I really don't know clouds at all]