“I’m very conscious of the fact that you can’t do it alone. It’s teamwork. When you do it alone you run the risk that when you are no longer there nobody else will do it.”
Source: The Green Belt Movement: Sharing the Approach and the Experience
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Wangari Maathai 9
Kenyan environmental and political activist 1940–2011Related quotes

“I can’t write without a reader. It’s precisely like a kiss—you can’t do it alone.”
Christian Science Monitor (October 24, 1979).

“What do you do when Mom leaves you alone like this? (Kat)
I write romance novels. (Acheron)”
Source: Devil May Cry

Also found in "Quotations According to Woody Allen" http://books.google.com/books?id=kd41AQAAIAAJ&q=%22quotations+according%22#search_anchor from the New York Times, 1 December 1975.

“When you screw up someone’s life, the least you can do is leave the person alone.”
Revolution 2020 (2011)