Global warming - General increase in the temperature of the world caused by pollution from cars, factories, etc., The ozone layer - A layer of natural gases around the Earth. The ozone layer protects the Earth from the harmful effects of the sun, but pollution is causing a hole in it., Climate change - Changes in the weather around the world, which result in much higher or lower temperatures, violent storms, floods, etc., The greenhouse effect - The gradual warming of the Earth caused by pollution that stops heat from leaving the Earth's atmosphere., Ecology - The way in which plants, animals, and natural features of a place affect and depend on each other., The environment - The air, water, and land where people, animals, and plants live., The food chain - The natural system in which, for example, an insect eats a plant, a bird eats the insect, an animal eats the bird, etc., with the result that all these different forms of life depend on each other., Habitat - The natural home of a plant or animal., Deforestation - A situation in which most of the trees in an area are cut down or destroyed, resulting in great damage to the environment., Rainforest - A tropical forest with tall trees growing very close together in an area where it rains a lot. It is very important for the balance of the Earth's ecology., Endangered species - A type of plant or animal that is likely to stop existing completely, for example, because of hunting or pollution.,

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