Acid rain: Rain that contains large amounts of harmful chemicals as a result of burning substances such as coal and oil
Part of speech: noun. I have never experienced acid rain
Air pollution: Harmful substances in the air, often consisting of waste from vehicles or industry
Part of speech: noun. Cars pollute the air a lot :(
Climate change: Changes in the world's weather, in particular the fact that it is believed to be getting warmer as a result of human activity increasing the level of carbon dioxide in the atmosphere
Part of speech: noun. Climate change is getting worse