«The ability to accurately estimate greenhouse gas sources and sinks is a prerequisite for international agreements or national emission reduction programs to be effective,» the academies said in a joint statement. (scientificamerican.com)
* * * A great many of us have near - infinite natural gas sources in our kitchens and somehow can live with that risk. (treehugger.com)
These results give an indication of the complexity of gas sources in the area. (dotearth.blogs.nytimes.com)