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2:11
Looking back on 1970's first Earth Day celebration.

0:59
What was the effect of Rachel Carson's book Silent Spring?

1:47
From the 1960s to today, US Presidents have talked about saving our environment.

0:56
The 1973 oil embargo highlighted US dependence on foreign oil.

0:58
What were environmental conditions like in the US in the early 1960s?

1:48
Congressmen with poor environmental records were targeted for defeat in 1970.

0:00
The call of sanitation workers for fair treatment drew Martin Luther King, Jr. to Memphis.

2:30
Whites willing to resort to racist violence found encouragement from high profile figures.

1:03
The 1968 attack of My Lai pushed soldiers and Americans to ask this hard question.

2:14
In the Vietnam War, military leaders failed to give moral guidance to scared US soldiers.

1:20
Lt. Calley's 1971 trial upset those who felt he was unfairly blamed for Vietnam mistakes.

3:10
Learning about My Lai changed American opinions about the Vietnam War.