Explore the rise and fall, from the1920s into the 1950s, of a cooperative apartment house built by immigrants, factory workers and Communists in the Bronx. (2:33)

Jewish immigrants buy land in the Bronx to realize their dream: the largest cooperative apartment complex built to date in America. (1:42)

Former residents of the Coops recall celebrating May Day, also known as International Workers' Day, and marching in parades. (1:56)

While the Coops were racially integrated, residents confronted racism in other parts of New York. (2:33)

Kenyan Nobel Peace Prize Laureate Wangari Maathai's simple act of planting trees grew into a global movement. (2:00)

The Green Belt Movement grew from a basic need for water and firewood, and Wangari Maathai is the woman who started it all. (3:18)

Wangari Maathai and the Green Belt Movement protest the closing of the only major park in Nairobi and succeed in keeping it open. (3:55)

Protected by armed guards, Wangari Maathai and Green Belt Movement members go on a tree-planting mission. (4:00)

A revolution in Africa is turning poachers into preservationists and local people into the stewards of natural resources. (2:15)