Unit 1 — Chemical Reactions and Their Environmental Impacts

Science — Third Preparatory

3.5 Environmental damage caused by smoking

Comparison aspect	Main idea	Keywords
Air pollution	smoking releases large amounts of carbon dioxide adding to global warming (the rise in Earth’s temperature caused by greater proportions of certain gases in the atmosphere). WHO estimates that tobacco releases tens of millions of tons of carbon dioxide every year	smokingreleaseslargeamounts
Water and soil pollution	cigarette butts are among the commonest forms of litter. They contain harmful chemicals that leach into soil and water and harm living organisms. Several trillion cigarette filters reach oceans rivers streets and beaches each year	cigarettebuttsamongcommonest

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