Contamination of the water , soil , or air by chemicals or waste materials .
The river is the main lifeline for over one billion people, yet pollution is threatening its future.
The process of land to grow food .
Don't have enough water .
extreme hunger; starvation.
a biological community of interacting organisms and their physical environment.
a political theory derived from Karl Marx, advocating class war and leading to a society in which all property is publicly owned and each person works and is paid according to their abilities and needs.
a bomb that derives its destructive power from the rapid release of nuclear energy by fission of heavy atomic nuclei, causing damage through heat, blast, and radioactivity.
political and spiritual leader during India's struggle with Great Britain for home rule; an advocate of passive resistance (1869-1948)
Chinese Communist leader and theorist. A founder of the Chinese Communist Party (1921), he commanded troops in the Chinese Civil War (1927–1949) and proclaimed the People's Republic of China in 1949.
a member of a small independent group taking part in irregular fighting, typically against larger regular forces.
a country in SE Asia, comprising the former states of Annam, Tonkin, and Cochin-China: formerly part of French Indochina; divided into North Vietnam and South Vietnam during the Vietnam War but now reunified. 126,104 sq
any of various radical or socialist groups, in particular a militant youth movement in China (1966–76) that carried out attacks on intellectuals and other disfavored groups as part of Mao Zedong's Cultural Revolution.