“Natural Gas: It is colorless, shapeless, and in its pure form, odorless. For many years, it was discarded as worthless. Even today, some countries (although not the United States) still get rid of it by burning it in giant flares, so large they can be seen from the Space Shuttle. Yet, it is one of the most valuable fuels we have.”
Explore information from US Dept. of Energy’s “Natural Gas – Fueling the Blue Flame” Website to continue reading (pdf) – includes: The History of Natural Gas; and Getting Gas from the Ground . . . and the Sea.