Since World War II the number of motor vehicles in the world increased from 40 million to 680 million; motor vehicles contribute to the amount of human-induced carbon dioxide emissions in the atmosphere.
Tangu kipindi cha Vita ya Pili ya Dunia idadi ya magari duniani yameongezeka kutoka milioni arobaini (40) hadi kufikia milioni mia sita themanini (680). Moshi utokanao na magari huchagia gesi ya carbon dioxide ambayo huzalishwa na watu na kuisambaza angani.