Eighteen months ago, Barack Obama took office pledging to deal with a “planet in peril.”

His party held big majorities in Congress, and the House answered by passing a tough cap-and-trade bill. A massive climate conference in Copenhagen, with Obama at the center of the action, focused the world on the need to address global warming.

Then came the nation’s worst-ever environmental disaster, an oil spill in the Gulf that put momentum behind environmentalists and scarred the image of big, polluting industries.

Add in a summer of record-high temperatures, and it would seem the stars had been aligned like never before for climate legislation.

But by Thursday, the White House’s biggest energy and environmental initiative sat in tatters, relegated to an unknown election-year abyss after Senate Majority Leader Harry Reid said he didn’t yet have 60 votes and would instead move to the lowest hanging energy fruit.

The blame game has already begun.

One exasperated administration official on Thursday lambasted the environmentalists – led by the Environmental Defense Fund – for failing to effectively lobby GOP senators.

“They didn’t deliver a single Republican,” the official told POLITICO. “They spent like $100 million and they weren’t able to get a single Republican convert on the bill.”