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The chemical pesticide DDT was used around the world from the 1940s through the early 1970s to kill crop-eating and disease-carrying insects. Pest control has become a difficult issue for farmers Polluted River in the United Kingdom The pollution of rivers and streams with chemicals Factories and plants pollute the atmosphere Forests, lakes, ponds, and other terrestrial and aquatic environments throughout the world are being severely damaged by the effects of acid rain. The greenhouse effect - global warming The Greenland ice is melting An increase in global warming will likely result in a rise in sea levels that could threaten many coastal areas around the world. Experts predict that parts of Bangladesh may become completely submerged if sea levels rise.