During the 1980s Rumpke began converting methane gas, the natural bi-product of waste decomposition, into usable energy.
(Rumpke; began; converting methane gas, the natural bi-product of waste decomposition, into usable energy; T:During the 1980s) Context(Rumpke began,List([17, 29))):(Rumpke; began converting; methane gas; into usable energy)
Rumpke began,List([17, 29))
Rumpke Rumpke
began began converting
converting methane gas, the natural bi-product of waste decomposition, into usable energy T:During the 1980s
methane gas into usable energy