Today we live in a world of chemical pollution.
Chemical production is a huge international business.
Many chemicals are harmful as well as helpful. The farmer's crops are protected from insects, fungi and weeds through the use of pesticides, fungicides and herbicides. Water is kept free from bacteria through massive chlorination. Cattle and poultry are treated with chemical antibiotics and hormones in order to produce more marketable products. Our highly populated industrial cities produce such high levels of air pollution that we must be warned about it on the nightly weather report.