pollution, Harmful waste in air or land, dirty city, Urban area with much litter, water pollution, Dirty rivers, lakes, or seas, dirty park, Green space full of trash, traffic jam, Too many cars cause this, accident, Crash often caused by careless driving, littering, Throwing trash on the ground, recycling, Turning waste into new materials, plant trees, A solution to cleaner air, public transport, Buses and trains reduce traffic.

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