Nitin Gadkari, Union Minister of Water Resources and Ganga Rejuvenation, said that Swachh Bharat Abhiyan is very necessary. 150 bio-digesters have been installed in Ganga, to extract methane from the river and use it in vehicles. The Union Minister said that at his Delhi home, a composting machine is installed. Mr Gadkari said that solid waste management can be an industry worth 5 lakh crore and that the Centre is experimenting with using plastic waste in building roads, as that is a cost-effective method of utilising waste. Mr Gadkari also promised that by March 2019, 70 to 80 per cent of river Ganga will be cleaned.