That's why we see the trend and the decline over the last decade of emissions from natural gas operations while we are at the same time increasing our production. (energytomorrow.org)
The new rules target new and modified oil and gas production sources, but not all existing natural gas operations. (treehugger.com)
This concept made Opel the first automaker to successfully optimize an engine for natural gas operation and still enable the use of conventional gasoline. (topspeed.com)