Obama has quickly switched from the bump to the boot. All week he’s been kicking over Bush-era dominoes, and today’s was a whopper. The Environmental Protection Agency is starting to review its 2007 refusal to let California regulate greenhouse gas emissions from vehicles. The review affects 16 other states that also want to control emissions. It’s a big deal that we’ve long been pushing for.

But, the biggest domino of all is still standing in the way of EPA really cracking down on greenhouse gases. We’re talking about that shameful "Johnson memo" issued by the Bush-EPA administrator of the same name just before Obama took office. The memo told EPA employees to ignore CO2 – the single largest contributor to global warming. Without saying it, the memo also said: Ignore a Supreme Court ruling that authorizes EPA to control CO2.

What an irresistible target for a bump from Obama’s boot.