Man made chemicals have decreased the amount of which important gas?

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.

option a and d is the correct answer

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you should wear a lead protective shield when having teeth x-rays

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-lavira : )