acid rain - n. rain that contains dangerous chemicals because of smoke from cars and factories

ozone layer - n. a layer of ozone in the upper atmosphere that prevents dangerous radiation from the Sun from reaching the surface of the Earth

greenhouse gas - n. a layer of gases, such as carbon dioxide, that trap the warmth from the sun in the Earth's atmosphere

executive order - n. an order that comes from the U.S. president or a government agency and must be obeyed like a law

ecosystem - n. a community of organisms and their surroundings that act as a unit

regulator - n. people who oversee enforcement of an official rule or law

emission - n. producing or sending out something, such as energy or gas

authority - n. the power to give orders or make decisions : the power or right to direct or control someone or something
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