Explain how the written word helped the environmental movement to gain momentum during the 1960s and 1970s

The correct answer to this open question is the following.

The written word helped the environmental movement to gain momentum during the 1960s and 1970s in that it helped the environmental movement to exert more pressure on the United States Congress to pass legislation that protected the environment. The written word spread the motives of the environmentalists so more people could be informed about their objectives and could support them. Congress passed laws aimed to reduce air and water pollution.

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