Solar energy - Any type of energy generated by the sun., Life expectancy - The average number of years of life a person who has attained a given age can expect to live., Climate change - A change in the average conditions — such as temperature and rainfall — in a region over a long period of time., Greenhouse gases - Gases in the earth's atmosphere that trap heat., Melting ice cap - Disappearance of thick layers of ice and snow that cover the North and South Poles., Fossil fuel - Fuel made from decomposing plants and animals, Endangered species - Animals or plants that are seriously at risk of extinction., Carbon footprint - A measure of the amount of carbon dioxide released into the atmosphere as a result of the activities of a particular individual, organization, or community., Renewable energy - Energy derived from natural sources that are replenished at a higher rate than they are consumed, Solid waste - Useless and sometimes hazardous material with low liquid content,

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