Atmosphere - The layer of air surrounding the Earth that protects us from the sun's harmful rays., Carbon dioxide - A transparent gas that is either emitted or absorbed by all living things., Climate - Typical weather conditions for specific parts of the world., Ecosystem - Natural habitats that support different kind of animals and plant life, such as coral reefs., Emissions - Gases or other substances discharged into the air, such as smoke or car exhaust fumes., Extinction - This happens when a plant or animal species dies out., Fossil fuels - Sources of energy derived from the remains of living things that died a long time ago. Gas, coal or oil form part of them., Global warming - A rise in the earth's temperatures caused by an increase in greenhouse gases., The Greenhouse effect - The effect that greenhouse gases have on the environment., Greenhouse Gases - Gases that allow radiation from the sun to pass through the earth's atmosphere and trap outgoing heat from the earth's surface., Solar energy - Energy generated by the sun.,

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