congestion, too much traffic causing delays, diesel, fuel used in many trucks, environment, the natural world around us, fuels, substances burned for energy, motorway, a major high-speed road, pollution, harmful waste in air or water, renewable, able to be naturally replaced, smog, dirty fog caused by pollution, sustainable, able to continue without harm, toxic, poisonous and harmful to living things

high note 3 unit 4e

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