45.Most effective and least costly means of dealing with water pollution is ________.
{"Image DocumentName": "45.Most effective and least costly means of dealing with water pollution is ________.", "Image ImageDescription": "45.Most effective and least costly means of dealing with water pollution is ________.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}