World Population

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Population policy

af Huang Shuming

Extinction

af Ryan Ung

Earth's Environmental Issues

af Kumar Bonita

Physical Geography

af Josh Turriff

acid rain

population: 200.4 million

Afghanistan

Thailand

population: 30.55 million

soil erosion

population: 67.01 million

Brazil

pollution

deforestation

natural disasters

Colombia

water pollution

population: 10.32 million

population: 48.32

Issues in Developing Countries

Haiti