1. Pollution
... as a result of the increasing number of motor vehicles on the roads. Exhaust fumes from the engines of automobiles contain a number of polluting substances. According to Taking A Stand Against Environmental Pollution by Newton, most of the substances that are harmful are: carbon monoxide and a variety of complex hydrocarbons and nitrogen oxides. When exposed to sunlight, these substances undergo a change in ... there were none previously. This happens because the pesticides destroy populations of predatory insects that had previously kept the plant-eating insects in check. According to ...
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