Mumbai, Sept. 2 -- Pollution is a cause of concern throughout the world. In terms of waste pollution, Maharashtra generates 15% of India's trash, with the state contributing 21,867 tonnes per day (TPD) of India's daily output of 1.42 lakh tonnes. Meanwhile, Mumbai, contributes about 10% of the state's pollution. Besides, were you aware that not just air, water, garbage pollution, but light pollution (excessive or obtrusive manmade light) is on the rise, too? We speak to three environment crusaders who have taken it upon themselves to do their bit for society ...