Where does energy come from?

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1.
windmill
2.
sailboat
3.
turbine
4.
farm
5.
coal
6.
oil
7.
gas
8.
pollution
9.
plant
10.
electricity
11.
subway
12.
engine
13.
carpool
14.
ambulance
15.
escalator
16.
train
17.
taxi
18.
elevator
19.
helicopter
20.
jam