The roofs of many homes are covered with photovoltaic (pv) solar cells that resemble roof tiles, generating electricity quietly from solar energy. an article stated that over its projected 30-year service life, a 4-kw roof pv system will reduce the production of co2 that causes global warning by 433,000 lbm, sulfates that cause acid rain by 2900 lbm, and nitrates that cause smog by 1600 lbm. the article also claims that a pv roof will save 253,000 lbm of coal, 21,000 gallons of oil, and 27 million ft of natural gas. making reasonable assumptions for incident solar radiation, efficiency and emission, evaluate these claims and make corrections if necessarv.