Rachel Carson's "A New Chapter to Silent Spring" was a 1963 speech to the Garden Club of America, taking her clarion call about the effects of pesticides on human health and the environment right to the people. Her conviction about her message helped her overcome her public speaking fears and changed our environment for the better.
Severn Suzuki's 1992 UN Earth Summit speech was delivered when she was just 12 years old, and she wisely kept her message in the voice of a child. "If you don't know how to fix it, please stop breaking it!" she urged the delegates.
Jane Goodall's "What separates us from the chimpanzees" uses unusual tactics, from sound "props" to Shakespearian influences, to put her message of wildlife conservation across. Another scared speaker, she learned from experience the value of speaking to live audiences to get her environmental message across.
Nobel laureate Wangari Maathai's hummingbird fable was a simple tale she used to convince audiences ranging from poor women in Kenya to powerful world leaders that a small volunteer effort could do much to protect important ecosystems. In her case, a campaign to reforest Kenya led to the planting of 30 million trees--and a Nobel Prize.
Christine Lagarde's speech on "dynamic resilience" led the World Economic Forum in 2013. Titled "A new global economy for a new generation," the International Monetary Fund's managing director put the assembled financial titans on notice that climate change and its effects had to be central to their efforts to reshape the world's economy.