1.  every school must do ...

1.  every school must do rainwater harvesting from a sloping roof to collect the rainwater after the 1st flush by filtering it into a covered cement tank of 20,000 liters size with a copper mesh size 3 x6 feet kept inside it to kill the bacteria & prevent algae will last for 9 months, depending on the tank size,

2. the waste water from the canteen & toilets can be fed to a vegetable garden to be grown by the students.