Original sentence: Compared to a coal plant of similar size, the operation of Seabrook Station avoids the release of certain waste gases into the atmosphere each year.The Seabrook plant uses ocean water to cool its reactors, raising the ambient temperature of the local ocean.There is currently no long-term solution to the problem of safely storing radioactive waste from the spent fuel.These gases include carbon and sulfur dioxides (contributors to global warming and acid rain respectively).This benefit is offset by the huge amounts of chlorfluorocarbons (extremely potent greenhouse and ozone-depleting gases) that are used in the enrichment of the uranium needed to fuel Seabrook station, as well as by the substantial amounts of energy required by the enrichment process itself
Edited sentence: Also avoided are over 150-200,000 million tons of solid wastes such as fly ash.Compared to a coal plant of similar size, the operation of Seabrook Station avoids the release of over 7 million tons of waste gases into the atmosphere each year.These gases include carbon and sulfur dioxides (alleged contributors to global warming and acid rain respectively)