Sentence examples for methane could stem from inspiring English sources

Scientists believe the methane could stem from micro-organisms, called methanogenes, that either became extinct millions of years ago and left gas frozen below the planet's surface, or that some methane-producing organisms still survive.

On the other hand, the methane and water vapor could stem from an erupting volcano, a simmering hot spring, or even abiotic reactions between rock and cold ground water.

But nothing could stem the avalanche.

But nothing could stem the optimism.

Could stem cells restore the damaged retina?

The creative spike could stem from this lowering of inhibitions.

The surprise could stem from an apparent contradiction.

Reducing atmospheric methane could have a significant global effect on human health.

The methane could be produced by purely geological processes, such as volcanic activity.

Capturing and selling that methane could turn this approach into a nice little earner.

Dr. Mumma acknowledged that he could not identify any phenomena that would explain why methane plumes spurted out that year but not more recently, or how methane could be destroyed much more quickly on Mars than on Earth.