Ethics and rates
Slide 49 Ethics and rates - stick with ammonia example
Fritz Haber podcast - good background - listen abd then do some click and revela questions.
http://www.rsc.org/learn-chemistry/resource/res00000036/anecdotes-fritz-haber#!cmpid=CMP00000023
Satis book 2 The story of Fritz Haber and the pesticide problem.
https://www.stem.org.uk/elibrary/resource/25903