On the Vietnam war:
No war in the 20th century has seen as massive an assault on the environment. Some 70 million litres of Agent Orange, a herbicide and defoliant, and other toxic chemicals were rampantly used by us armed forces. It completely destroyed about 10 per cent of forests in South Vietnam, including a third of coastal mangroves
Links:
[1] http://admin.indiaenvironmentportal.org.in/opinion/massive-assault
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment-impact-assessment-eia
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cancer
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/development
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ecology
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/chemical-weapons
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vietnam
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/war