Mezue nkebi ahịrịokwu a: N'ime ọtụtụ afọ, nnyocha Varanasi mere gosiri otú ihe ndị dị ndụ n'oké osimiri si achịkọta ma na-edozi ihe ndị na-emetọ gburugburu ebe obibi dị ka hydrocarbons, ihe ndị na-egbu egbu dị na mmanụ ala. Ya na ndị otu ya nyochara ahụike azụ na Puget Sound dị nso na Seattle, wee nweta ahụmịhe na nchọpụta mmanụ na nyocha ngwa ngwa. A na-eji usoro ndị ahụ eme ihe n'oge nzaghachi nchekwa nri mmiri nke NOAA mgbe ọdachi ndị metụtara gburugburu ebe obibi gasịrị, gụnyere mmanụ Exxon Valdez na Alaska, Agha Gulf Persian, Hurricane Katrina na
Ọdachi Deepwater Horizon na Gulf of Mexico.