Global Warming. No Republican candidates mention climate as a front-burner issue. None has published a detailed energy policy, so it's difficult to distinguish between them except in broad brushstrokes.
McCain, who has been endorsed by Republicans for Environmental Protection, was a co-sponsor of the first Senate bill designed to tackle climate change, way back in 2003 -- making him an early and vocal supporter of action. That law would have reduced carbon dioxide emissions 30% below 2004 levels by 2050. He still supports a cap-and-trade system for reducing greenhouse gas pollution, but hasn't said whether that would be his goal as president.
Gov. Mike Huckabee is the only other Republican to endorse a cap-and-trade regulation, and he hasn't said anything specific about the goals he'd set.
Two candidates -- Reps. Ron Paul and Tom Trancedo -- are the only candidates to openly oppose a cap-and-trade system. Paul opposes government regulation of virtually any stripe, and Tancredo has said he would be very skeptical of any cap-and-trade regulation. The other candidates -- Rep. Duncan Hunter, Gov. Mitt Romney and Sen. Fred Thompson -- haven't gone on the record either way, though Romney kept Massachusetts from joining a coalition of Northeast states that is setting up a cap-and-trade rule for power plants, and Hunter has voted against similar rules in Conigress.
For most of the Republican candidates, energy policy is centered around achieving "energy independence" in one form or another, as a plank of national security policy. That means they're more likely than Democrats to embrace nuclear power, increased use of domestic coal and fossil fuel exploration in North America, including the Arctic National Wildlife Refuge.
Vehicle Efficiency.McCain and Huckabee have said they support increases in vehicle fuel economy. Romney has said he'd consider mandated increases to fuel economy only as a last resort.
Some SpecificsHere's a look at policies that specifics that may set one candidate apart from other Republicans, in alphabetical order, but only including those candidates that have said something that sets them apart from their competitors:
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