Natural gas is a clean-burning fuel.    From Wordnet, Princeton University. 

You need something clean-burning like Tequila or Vodka.    From Wordnik.com.  [Hangover Cures: Myth, Legend, Fact | Lifehacker Australia] Reference

Giuliani also called for more clean-burning domestic natural gas.    From Wordnik.com.  [Power to the People: Sweet Rudy Blue Eyes] Reference

A relatively clean-burning fuel, natural gas is in growing demand.    From Wordnik.com.  [Gas Producers Rush to Pennsylvania] Reference

Plus, natural gas is clean-burning and in abundant supply in North America.    From Wordnik.com.  [Toyota announces natural-gas Camry hybrid] Reference

They're using old vegetable oil to create a new clean-burning biodiesel fuel.    From Wordnik.com.  [CNN Transcript May 29, 2007] Reference

They lobby for hydrogen made from coal, because hydrogen is so clean-burning.    From Wordnik.com.  [Nukes can never be the answer] Reference

The coal plants would be replaced with a clean-burning natural gas power plant.    From Wordnik.com.  [Bruce Nilles: Persistence Stops a Train and Global Warming Slowed] Reference

I said that the fuel that is derived from coal happens to be a very clean-burning fuel.    From Wordnik.com.  [CNN Transcript May 13, 2008] Reference

Colombia's coal is relatively clean-burning, with a sulfur content of less than 1 percent.    From Wordnik.com.  [Energy profile of Colombia] Reference

The legislation would also increase production of clean-burning ethanol and other biofuels.    From Wordnik.com.  [Foreign-Fuel Reliance Stirs] Reference

Now hydrogen is being touted as a clean-burning environmentally friendly fuel of the future.    From Wordnik.com.  [CNN Transcript May 20, 2007] Reference

Ethanol is a clean-burning fuel that is good for our environment and good for rural America.    From Wordnik.com.  [Statement By The Vice President On House Support For Ethanol] Reference

Gas is very clean-burning, does not require saggars, and the burners are also simple to manufacture locally.    From Wordnik.com.  [3. Temperature ranges and requirements] Reference

Penney's idea doesn't make sense if the cars use gasoline, but clean-burning hydrogen would be another story.    From Wordnik.com.  [Power People] Reference

Thanks to nuclear fusion, helium-3 will someday be that long-envisioned clean-burning, limitless energy supply.    From Wordnik.com.  [American Beat: Spaced-Out Invaders] Reference

Clinton said the initiative would seek to install 100 million clean-burning stoves in kitchens around the world.    From Wordnik.com.  [Amid diplomatic speed-dating, Clinton pitches 'clean stoves'] Reference

The Santa Ana, Calif., holding company makes and sells components that enable engines to run on clean-burning fuels.    From Wordnik.com.  [Late Rally Lifts Small-Caps; UniSource, Andersons Gain] Reference

But if you can answer that part of the problem, you then have a clean-burning fuel that is not coming from crude oil.    From Wordnik.com.  [CNN Transcript May 13, 2008] Reference

It contains relatively little carbon dioxide and sulfur, so it's more clean-burning than coal, oil or conventional gas.    From Wordnik.com.  [Australian Coal-Gas Sparks a Deal Boom] Reference

In 2007, models with clean-burning European engines will start cropping up -- although, like hybrids, they'll cost more.    From Wordnik.com.  [What We Need is Policy] Reference

"So," Tolland said, looking uneasy, "you're saying NASA has a clean-burning propulsion system that runs on pure hydrogen?".    From Wordnik.com.  [Deception Point]

If oil or coal is available, the additional costs of using saggers should be compared with the cost of clean-burning fuels.    From Wordnik.com.  [4. Decisions] Reference

A shortage of clean-burning natural gas to fuel economic expansion in the U.A.E. has the country scrambling for new sources.    From Wordnik.com.  [Iran Uses Price Power in $2 Billion Gas Deal] Reference

The best fuel would be electricity - which burns with no harmful exhausts, and natural gas - which is relatively clean-burning.    From Wordnik.com.  [Safety Tips Concerning the Use of Home Heating Systems] Reference

Ethanol interests are working to shape a clean-burning fuel proposal in Washington as they fight a similar effort in California.    From Wordnik.com.  [Industries Resist and Court Obama at Same Time] Reference

Sing to me of technicolored belly button lint, and how it might be used as a clean-burning fuel source for the cars of tomorrow.    From Wordnik.com.  [I wrote this for me. Wait. No I didn't ...] Reference

Natural gas is a clean-burning fuel with lower carbon dioxide, carbon monoxide, hydrocarbon, and nitrous oxide emissions than gasoline.    From Wordnik.com.  [Chapter 8] Reference

Which of the two countries (Iran or Saudi Arabia) is part owner of the second largest reserve of clean-burning natural gas in the world?.    From Wordnik.com.  [Nathan Gonzalez: Who's Our Enemy Again?] Reference

More than 4,100 of the 20,000 city buses run on clean-burning compressed or liquefied natural gas -- the largest such fleet in the world.    From Wordnik.com.  [Alex Pasternack: How Beijing Cleans Its Air (and Fakes It Too)] Reference

This clean-burning, renewable fuel is making its way into a growing number of American homes as a substitute for residential heating oil.    From Wordnik.com.  [Biodiesel Keeps Home Fire Burning] Reference

Renewable energy and clean-burning natural gas are the basis of a new strategy the world needs to create a cleaner and more secure future.    From Wordnik.com.  [New Priorities For Our Energy Future] Reference

With a web of hydroelectric stations and half its fleet of cars running on clean-burning sugar-cane ethanol, the country has long been the benchmark in renewable energy.    From Wordnik.com.  ['The Most Popular Politician on Earth'] Reference