The International Day for Preventing the Exploitation of the Environment in War and Armed Conflict is an international day observed annually on November 6. The International Day for Preventing the Exploitation of the Environment in War and Armed Conflict was established on November 5, 2001, by the United Nations General Assembly.
At the time of war, it affects the ecosystem such as water supply is poisoned, the forest is burnt, animals killed, etc. Though humanity has always counted its war casualties in terms of dead and wounded soldiers and civilians, destroyed cities and livelihoods, the environment has often remained the unpublicized victim of war. Water wells have been polluted, crops torched, forests cut down, soils poisoned, and animals killed to gain military advantage.
Source: The United Nations