Industrial Damage:

Each year 450,000 tonnes of lead are released into the air by humans, compared with 3,500 tonnes from natural sources. Acid rain ranks among the most serious threats to the environment in the northern hemisphere. Heavily industrialized areas pump some 90 million tonnes of sulphur dioxide into the air each year. Although DDT was prohibited for use within the U.S. as long ago as 1972, the U.S. still
manufactures over 18 million kilogram's a year for export, largely to the Third World.