As All Doctors & Health allied  knows & taught in  medical schools / colleges that  Oxygen is  a gas  & necessary for health & carbon dioxide is  produced gas in body that we exhale & in 100 % carbon  dioxide environment no body can survive & in 100% of  oxygen too. This is the cycle of life . Carbon dioxide is as important as it stimulate our brain centers to increase the respiratory rate  or When no respiration in newborn  child just after delivery of patient or child birth, it the blood gases  level stimulate the brain respiratory centres to start  coughing  reflex & respiration.

Nature has given US lot oxygen to  manage the carbon dioxide by providing us greenery / plants /  CHLOROPHYLL for continuation of life. In the hills nature has give lot of trees to counter the effect of less oxygen in hills & to manage carbon dioxide to continue life cycle. Where no greenery  nature has…