Compare of the growth of two groups of plants in this experiment

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.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."