US military no relation herbicides
Historical events
Vietnam
The Vietnam War had significant environmental implications due to chemical agents which were used to destroy militarily-significant vegetation. Enemies found an advantage in remaining invisible by blending into a civilian population or taking cover in dense vegetation and opposing armies which targeted natural ecosystems. The US military used “more than 20 million gallons of herbicides [...] to defoliate forests, clear growth along the borders of military sites and eliminate enemy crops." The chemical agents gave the US an advantage in wartime efforts. However, the vegetation was unable to regenerate and it left behind bare mudflats which still existed years after spraying. Not only was the vegetation affected, but also the wildlife: "a mid-1980s study by Vietnamese ecologists documented just 24 species of birds and 5 species of mammals present in sprayed forests and converted areas, compared to 145–170 bird species and 30–55 kinds of mammals in intact forest." The uncertain long-term effects of these herbicides are now being discovered by looking at modified species distribution patterns through habitat degradation and loss in wetland systems, which absorbed the runoff from the mainland.Rwanda
The Rwandan genocide led to the killing of roughly 800,000 Tutsis and moderate Hutus. The war created a massive migration of nearly 2 million Hutus fleeing Rwanda over the course of just a few weeks to refugee camps in Tanzania and now modern day the Democratic Republic of the Congo. This large displacement of people in refugee camps puts pressure on the surrounding ecosystem. Forests were cleared in order to provide wood for building shelters and creating cooking fires: “these people suffered from harsh conditions and constituted an important threat impact to natural resources.” Consequences from the conflict also included the degradation of National Parks and Reserves. Another big problem was that the population crash in Rwanda shifted personnel and capital to other parts of the country, thereby making it hard to protect wildlife.Other examples
1938 Yellow River flood, created by the Nationalist government in Central China during the early stages of the Second Sino-Japanese War in an attempt to halt the rapid advance of the Japanese forces. It has been called the "largest act of environmental warfare in history".
Beaufort's Dyke, used as a dumping ground for bombs
Jiyeh Power Station oil spill,  bombed by the Israeli Air Force during the 2006 Israel-Lebanon conflict.
Formerly Used Defense Sites, a U.S. military program which is responsible for environmental restoration
K5 Plan, an attempt by the government of the People's Republic of Kampuchea to seal off Khmer Rouge guerrilla infiltration routes into Cambodia between 1985 and 1989, resulting in environmental degradation.
Saudi Arabian-led intervention in Yemen, an intervention in a civil war in the Middle East, disrupted the water-energy-food security nexus in an already resource-poor country. The war and the conflict led to the contamination of water and agricultural lands.Militarism and the environment
Human security has traditionally been solely linked to military activities and defence. Scholars and institutions like the International Peace Bureau are now increasingly calling for a more holistic approach to security, particularly including an emphasis on the interconnections and interdependencies that exist between humans and the environment. Military activity has significant impacts on the environment. Not only can war be destructive to the socioenvironment, but military activities produce extensive amounts of greenhouse gases (that contribute to anthropogenic climate change), pollution, and cause resource depletion, among other environmental impacts.
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