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- German
- action
- agreement
- deep
- dry
- guide
- nod
- require
- technology
- wheel
- acid rain
- after all
- battery
- best-known
- biogas
- bite
- can
- cloth
- disadvantage
- disagreement
- distance
- efficient
- electric
- electricity
- give up
- hurry up
- insect
- maglev train
- nuclear
- organization
- ought to
- path
- per
- planter
- plastic
- process
- protection
- recycle
- remove
- renewable
- replace
- run out
- shut off
- source
- steam
- steel
- straw
- sunlight
- wave
- worldwide