<prompt> Among the following, which of the following isare the greatest contributors to global warming as a consequence of human activities and life style ?Carbon dioxideChlorofluorocarbonsMethaneOzone  <response>: Carbon dioxide is not commonly regarded as an air pollutant it is a natural constituent of air. It does not take pa in any significant chemical reactions with other substances in the air However, it could increase global temperature enough to affect climate markedly 