They can harvest rainwater and use it for watering plants Namakkal: District Forest Officer (DFO) Ashish Kumar Srivastava expressed confidence that educational institutions of this district could play a major role in increasing the district's green cover. Speaking at the World Forestry Day celebration organised at a private college here on Monday, he said the district had only 16 per cent of forest cover against 33 per cent forest and tree cover of the over all geography for eco stability and sustainability.