To keep Yamuna pollution free, crores have been spent but still now water is so polluted that not only fishes but other species cannot survive. Yamuna's water only in past some decades has found to
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/past-there-were-crocodiles-yamuna-now-there-poison
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/navbharat-times-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment