atmosphere:the envelope of gases surrounding the earth or another planet.

cutting:a piece cut off from something, especially what remains when something is being trimmed or prepared.

untreated sewage: Residual water or also called sewage is any type of water whose quality was negatively affected by anthropogenic influence.

global warming:a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants.

air pollution:the presence in or introduction into the air of a substance which has harmful or poisonous effects.

carbon dioxide:a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.

overfishing:deplete the stock of fish in (a body of water) by too much fishing.

desertification:the process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture.

acid rain:rainfall made sufficiently acidic by atmospheric pollution that it causes environmental harm, typically to forests and lakes

greenhouse gas:a gas that contributes to the greenhouse effect by absorbing infrared radiation, e.g., carbon dioxide and chlorofluorocarbons.

deforestation:the action of clearing a wide area of trees.

coastal flooding:Coastal flooding normally occurs when dry and low-lying land is submerged by seawater.

endangered species:a species of animal or plant that is seriously at risk of extinction.