Attention Megan McArdle: If you read Ronald Bailey's latest piece on Rio+20, it's hard to believe this is the same author who wrote "Gore has won the global warming debate...On balance Gore gets it more right than wrong on the science"

Ronald Bailey: Rio +20 Earth Summit: The End of International Environmentalism - Reason.com

Watching green ideology crash and burn ...Looking back the failure of environmentalism as an ideology looks inevitable since has misconstrued the causes of many of the problems to which it claims to have a solution. At the close of the Rio +20 Earth Summit last Friday, environmentalism reached its highwater mark and is now ebbing as a political force internationally. It will be interesting to see in which direction those cherishing a permanent animus against democratic capitalism will go.

Bailey, 2006: An Inconvenient Truth - Reason.com

Gore has won the global warming debate—the world is warming as a consequence of human activity, chiefly the loading up of the atmosphere with carbon dioxide from burning fossil fuels.... On balance Gore gets it more right than wrong on the science

2008:  AFF Doublethink Online » I Want to Believe?

Bailey has a reason to be apprehensive. He was once one of the leading skeptics of climate change. Yet in recent years he has shifted. He now believes that global warming is real, man-made, and potentially a serious problem. This stance has led him to embrace taxes as a solution.

...“Ron changing his mind on global warming cemented my own transition to an AGW (i.e., man-made climate change) believer,” says Atlantic blogger Megan McArdle.