conservation effort - measures to protect and restore the natural world, ecosystem - the complex system of relationships between living things and their environment, endangered species - animals or plants in danger of becoming extinct in the near future, environmentalist - a person who cares about the natural world and makes efforts to protect it, extinction - the loss of a species of animal, bird, plant, etc for all time, food chain - a group of organisms in which each feeds off the one below it in the chain, fossil fuel - a fuel formed from the fossils of plants or animals that died millions of years ago., global warming - the gradual increase of air and sea temperatures caused by rising greenhouse gas levels, greenhouse gas - a gas in the atmosphere that prevents heat from escaping into space, habitat - the area where a species naturally lives, eats, and reproduces, recover - to help a certain species repopulate an area, renewables - forms of energy that can be replaced naturally, such as hydro-electricity, solar energy and wind power, risk - engage in a dangerous act, vulnerable - likely to face injury or danger, wildlife - plants and animals living in a natural environment,

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