Ten sports cars rated by smog and greenhouse gas performance

Some of the more pressing environmental problems facing cities and the world include photochemical smog and climate change. The former is caused in part by a chemical reaction between sunlight and air pollution emissions from such sources as industries, power plants, commercial and residential facilities, and motor vehicles. Those same sources contribute to an accumulation of carbon dioxide (CO2) and other greenhouse gas (GHG) emissions which are driving climate change and the warming of the planet.

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