"A growing body of research is shedding light on the ways that air pollutants impinge on the health of the American public. Indeed, the Environmental Protection Agency highlighted this concern in December when, after reviewing the evidence, it ruled that greenhouse gases are detrimental to human health, particularly because they can aggravate asthma and other respiratory illnesses and can produce longer, more intense heat waves that endanger the poor, sick, and elderly." (Quoted from article)