The National Oceanic and Atmospheric Administration (NOAA) announced last week that carbon dioxide concentrations at the Mauna Loa Observatory in Hawaii surpassed the milestone 400 parts per million for a sustained period.

Knowing what's behind Congress's passion for ethanol as a fuel is not quite as inscrutable as knowing what sparks romantic love, so let's look at some possibilities.

Companies like Daimler U.S. in Portland make natural gas trucks; ask them what they need to sell more and their answer is crisp: "pumps, pumps, and more pumps." Most truckers who want to save money by fueling with natural gas can't, because there are not CNG or LNG outlets on their routes.

A new study published in the journal Proceedings of the National Academy of Sciences indicates that even as high as 30,000 feet in the sky, fungi and bacteria are present in the air. These living microorganisms could very well affect global climate.

(Adds gasoline comparative pricing in paragraphs 24, 25) * Food, livestock producers want US to waive ethanol mandate * ...

Dry conditions that continue to grip Midwestern states, damaging crops and threatening to push up food prices, stirred new debate this week after the U.S. Department of Agriculture (USDA) released crop yield projections capturing the severity of the drought.

CARSON CITY, Nev. (AP) — Common household trash will be converted into ethanol for transportation fuel at a planned biofuel production facility in n...

As the founder and CEO of Bloomberg New Energy Finance, Michael and his team are the world's most comprehensive providers of independent analysis, data and news in the clean energy and carbon markets.

TWITTER: @GreenNewsReport. The 'GNR' is also now available on your cell phone via Stitcher Radio's mobile app!. IN TODAY'S RADIO REPORT: Food v. F...

The U.S. is the largest exporter of corn in the world, but the latest USDA estimates are that we will be exporting 300 million fewer bushels due to tight supply and higher prices. What is the hidden ingredient in rising corn prices?

Our collective dependence on oil remains a fundamental threat to our economies, our security, and the very lands and waters upon which we depend and which we love.

Given the potential of drop-in biofuels, the U.S. and EU have every reason to raise renewable fuel thresholds higher. Advantages include energy security, reduced dependence on foreign oil, fewer carbon dioxide emissions and domestic job creation.

By Matt Daily May 18 (Reuters) - After a decade of promise, advanced biofuels makers are entering a crucial make-or-break period with ...

Water is running off poorly managed fields that have been treated with chemical fertilizers and manure is loaded with nitrogen and phosphorus, two potent pollutants that set off a cascade of harmful consequences.

Roots of mighty oaks push up through New Orleans sidewalks while trees in the metropolis often tower above nearby buildings. Nearly half of Louisiana, in fact, is covered with forests, and the southern U.S. as a whole is considered the nation's wood basket.

If the pipeline is approved, some environmental groups say they'll sue -- but if it is cancelled, the company proposing the pipeline, TransCanada, will probably reapply.