It may sound strange or funny to you, but man needs protection as much as animals do. People must keep their habitats — houses, towns and cities — ecologically clean. In the places where people drink bad water, eat unhealthy food and breathe polluted air, they may have serious diseases and die early. Their children are often born weak. Doctors prescribe them medicines which can't help them. This problem becomes more and more serious with every passing day.

1. It may sound strange or funny to you, but man needs protection as much as animals do. People must keep their habitats — houses, towns and cities — ecologically clean. In the places where people drink bad water, eat unhealthy food and breathe polluted air, they may have serious diseases and die early. Their children are often born weak. Doctors prescribe them medicines which can't help them. This problem becomes more and more serious with every passing day.