A tree provides us with fresh air and oxygen without which the existence of life on earth becomes impossible. We need to do more tree plantation campaigns as trees not only provide with oxygen but also play an essential role in the ecology. Ecological imbalance can cause flood, drought and various other natural calamities that can lead to the destruction of life. “A human consumes about 550 liters of pure oxygen per day. Based on a market survey, we found out that the average cost of a 2.75-liter portable oxygen cylinder is Rs. 6,500. At this rate, a human consumes worth about Rs. 13 lakhs of oxygen per day” TOI reported.