In the 1970s , acid rainwater stimulate by sulfur emissions kill trees and even dissolved statue . But the US Clean Air Act dial back the deadly rain . Until now . Why has the rain fail acidic again ?
The principal culprit now is nitric back breaker , which is triggered by emissions from ability plants and cars , as well as fertilizer use on factory farms .
harmonise to Scientific American :

Part of the problem date back to WWI , when two German scientists invented the Haber – Bosch process , which took nonreactive atomic number 7 from the zephyr ( N2 ) and converted it into reactive , usable ammonia ( NH3 ) . Most of the nitrogen glean via this procedure has been used in fertilizer , and the overspill from farm has create dead zone in Chesapeake Bay and at the sass of the Columbia and Mississippi rivers . Some crusade have been made to influence the agricultural nitrogen runoff , but atmospheric emissions of agricultural ammonia remain almost unrestricted .
Agri - ammonia megrims also derive from saturated brute eating operations in the U.S. South . The gas jump into the air and is deposited dry or in rainfall where in the basis bacteria discover it into nitrogen and nitric Elvis , which can obliterate fish and plants . “ Agriculture Department is increasingly functioning as an intensively oversee industrial operation , and that is creating serious water , grime , and air problems , ” says Viney Aneja , a prof at North Carolina State University in Raleigh . Aneja says that state ’s saturated beast feeding operations may also emit particulate subject from swine and volaille manure into the atmosphere , which can bear diseases .
In other words , farm are deadly polluters of the environment . The good news is that sulfur emission , which induce the last round of drinks of acid rainfall , have been reduced by 70 percentage since 1990 . It ’s potential that N emissions can be operate too .

viaScientific American
Chemistryearth scienceScience
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