Deroy Murdock‘s latest column examines Republican presidential contender Mitt Romney’s response to global warming alarmism during his career in public life.

Willard Mitt Romney these days could not be more explicit about abandoning President Obama’s carbon-dioxide restrictions.

“Irresponsibly,” Romney wrote in an August 28 op-ed for the Foster’s Daily Democrat in New Hampshire, “the EPA declared carbon dioxide, the same carbon dioxide that humans exhale, to be a ‘pollutant’ that poses risks to human health.” He also observed: “Congress had the good sense not to compound our economic challenges by imposing cap-and-trade’s extraordinary costs on the American people.”

Romney’s website offers this carbon-friendly promise: “Mitt Romney will eliminate the regulations promulgated in pursuit of the Obama administration’s costly and ineffective anti-carbon agenda.”

Well — surprise, surprise! Unlike this conservative aria, Romney sang a totally different tune as Massachusetts’ liberal-Republican governor.

A recently exposed, online dossier from the 2008 John McCain campaign offers 200 pages of Romney’s self-contradictions, vacillations, and head scratchers. His views on so-called “global warming” are just the tip of this non-melting iceberg of confusion.