Conservation is the act of guarding, preserving and protecting. So conserving will help reduce air pollution because instead of letting thing go to the wrong garbage or whatever you can save and conserve and even reuse. decreases air pollution.
Answer:
Could either be D or B but personally I think it is B
Preparing food in small batches.
Do not eat ....but that is not recommended
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C invite a friend to exercise with you on a regular basis
