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If every U.S.household used just one 500-sheet roll of toilet paper made from 100% recycled paper in place of a roll made from virgin timber, 425,000 trees would be saved each year.
Q20: Aside from Marco Polo, the Chinese had
Q32: Human inputs of outdoor air pollutants occur
Q40: Mexico City's air and water pollution cause
Q47: Concerned citizens have persuaded Congress to enact
Q51: Ninety three percent of the carbon dioxide
Q53: Automobile accidents have killed more Americans than
Q59: At least _ % of the oil
Q73: Burial or long-term storage of hazardous waste
Q95: The troposphere is about 17 kilometers thick
Q100: About 98.5% of all solid waste in