Today, President Obama ordered the Environmental Protection Agency (EPA) to review the Bush administration’s rejection of California’s request for a waiver under the Clean Air Act that would allow California to enforce greenhouse gas emission standards on automobiles. The President said, “Now is the time to meet the challenge at this crossroad of history by choosing a history that is safer for our country, prosperous for our planet and sustainable.” The executive order does not come as a surprise, and it’s expected that the EPA, in reviewing California’s request, will ultimately grant the waiver. Even if the waiver is eventually granted, it is likely to be challenged in court and may face tough scrutiny as it will represent a reversal of an EPA position.