Определите значение и функцию ing-форм в следующих предложениях. a) Air pollution is producing harmful effects in man. b) Respiratory diseases, including chronic bronchitis and emphysema can cause heart failure. c) The first effects of air pollutants are capable of disturbing the comfort of the population in residential or industrial areas. d) Most of those who died were elderly people already suffering from disease of the respiratory or circulatory systems. e) Chemical pollutants are the major concern because of expanding industrial, automobile and domestic wastes.