It wasn’t long ago that Marco Rubio and Tim Pawlenty — two rising Republican stars — supported legislation to limit greenhouse gas emissions. But in recent weeks, both have begun to express doubts about whether cars, factories and power plants have anything to do with global warming.
The shift by Rubio and Pawlenty — as well as other prominent Republicans — reflects the rising power of climate change skeptics in the GOP, where global warming is becoming a litmus test for conservatives.
Rubio, former speaker of the Florida House of Representatives, is running for the U.S. Senate. Pawlenty, Minnesota’s governor, is eyeing a 2012 presidential bid.