Garbage can be used to generate energy. This is done by landfill gas plants such as the one by DEW21 in Dortmund Grevel. The plant, which has been built...

Garbage can be used to generate energy. This is done by landfill gas plants such as the one by DEW21 in Dortmund Grevel. The plant, which has been built...

The humming sound of an generator (steam turbines connected to a generator) at Ringhals nuclear power plant. Sound Recorder: Fredrik Johansson Photography:...

Close up recording of the engine. This large diesel-driven hot bulb engine was built and installed at the Pythagoras-Drott mechanical works in 1932. It...

Engine stopping. This large diesel-driven hot bulb engine was built and installed at the Pythagoras-Drott mechanical works in 1932. It has been used...