Hope for Progress at UN Climate Talks in Lima

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emission -  n. the act of producing or sending out something (such as energy or gas) from a source

fossil fuel – n. fuel (such as coal, oil, or natural gas) that is formed in the earth from dead plants or animals

pollute – v. to make (land, water, air, etc.) dirty and not safe or suitable to use

challenge – v. to invite (someone) to compete in a game, fight, etc.

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