Acid rain: Rain that contains large amounts of harmful chemicals as a result of burning substances such as coal and oil.
Noun. Acid rain is falling
Air pollution: Harmful substances in the air, often consisting of waste from vehicles or industry.
Noun. Diesel exhaust is a major contributor to air pollution.
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.
Noun: The President called for urgent action on climate change.
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