They allege that the company's drilling polluted their water with chemicals,metals and methane, the main constituent of natural gas, causing explosions as well as gastrointestinal and neurological illness.

VOA: standard.2010.01.02

In January,a team of NASA and university scientists announced that they had found methane gas on Mars.

VOA: special.2009.12.30

The orbiter could finally provide evidence about how methane on Mars is created and destroyed.

VOA: special.2009.12.30

This suggests processes that both supply and remove methane from the atmosphere in certain places.

VOA: special.2009.12.30

For example,animal waste and cattle digestive systems release methane gas.

VOA: special.2010.01.05

Manure from about 1,000 cows goes in one end and then, controlled decomposition yields methane gas at the other.

VOA: standard.2010.02.23

But cars and trucks that run on methane are still a novelty in the U.S.

VOA: standard.2010.02.23

"When the gas comes off the digester, it has not only methane in it it also has carbon dioxide And it has a trace of hydrogen sulfide."

VOA: standard.2010.02.23

Bigger livestock herds are putting greater pressure on land resources and disrupting some ecosystems and the animals generate significant amounts of water and air pollution, including methane, a climate-changing greenhouse gas.

VOA: standard.2010.02.22