Turn street lights off for at least part of the night
Responsible department: Department for Transport
Street lights are often left on all night when no one is around.
Their ability to reduce crime is debateable as they provide lighting for the criminals as well. They do, however, use lots of energy, and cause disruption to wildlife and humans alike.
So, turning them off between, say, 1am and 5am would save a lot of electricty and cause virtually no problems.
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