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Startseite:
Butz.2013, green energy, CC BY 2.0
Jenny Ondioline, socket challenge, CC BY 2.0
ullihaessler, Alter Heizkörper, Public Domain Mark 1.0
Joe Shlabotnik, Faucet, CC BY 2.0
futureatlas.com, Pumping gas, CC BY 2.0
Energie: Michael Coghlan, Link in the Chain, CC BY-SA 2.0
Energiegewinnung:
CGP Grey, California - Oil Pumps, CC BY 2.0
Mark Goebel, hz1649.JPG, CC BY 2.0
Nick Cross, Wind Energy Image from Gurit, CC BY-ND 2.0
Wayne National Forest, Wayne National Forest Solar Panel Construction, CC BY 2.0
Allie_Caulfield, 2015-02 Sauerlach 036 Unterhaching Geothermie, CC BY 2.0
Frerk Meyer, Biogasanlage Energiepark Trelder Berg, CC BY-SA 2.0
Strom: espensorvik, AC power plug/socket, CC BY 2.0
Wärme: ullihaessler, Alter Heizkörper, Public Domain Mark 1.0
Wasser: Rocky Lubbers, Hand Splash (50/365), CC BY 2.0
Sprit: Boegh, Fuel, CC BY-SA 2.0