globalisation - increasing business, cultural and other contacts between countries, acid rain - rain which contains harmful chemicals as a result of burning substances such as oil and coal, air pollution - damage caused to the air by harmful substances or waste, global warming - rise in the world’s temperature, hazardous - dangerous, ozone depletion - reduction in the ozone layer [layer of air above the Earth containing ozone which prevents harmful ultraviolet light from the sun from reaching Earth], smog - air pollution found in cities caused by a mixture of smoke, gases and chemicals, water pollution - the contamination of water with chemicals and microorganisms , overpopulation  - a country, a city, etc. has too many people for the amount of food, materials, and space available there., rainforest destruction - destroying (cutting down) forest in a tropical area which receives a lot of rain, greenhouse effect - an increase in the amount of carbon dioxide and other gases in the atmosphere, that is believed to be the cause of a gradual warming of the surface of the earth, climate change - long-term shifts in temperatures and weather patterns, species - types, endangered - very few in number, at risk of becoming extinct, to become extinct - to die out, not exist any longer ,

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