VOA慢速英语:Everyday Grammar: The 'Should' vs. 'Shall' Debate

developed country - n. a country that has fewer poor people because it has industry and can raise money

developing country - n. a country that has more poor people because it lacks industry and people are unable to buy the things they need

greenhouse (gas) - adj. relating to the warming of the Earth's atmosphere that is caused by air pollution

emissions - n. produced or released (such as energy or gas) from a source

crystal clear - (idiomatic expression). without a doubt; very certain