Ecology focuses on how human activities affect an ecosystem and ways to mitigate resulting issues.

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

feral cats are estimated to eat tens of millions of native animals each night in australia