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Silent Spring was a best seller, and public reaction to it launched the modern environmental movement in the United States.
The year after it appeared, President Kennedy ordered his Science Advisory Committee to investigate Carson's claims.
The report the committee issued " add up to a fairly thorough-going vindication of Rachel Carson ’ s Silent Spring thesis ," in the words of the journal Science, and recommended a phaseout of " persistent toxic pesticides ".
DDT became a prime target of the growing anti-chemical and anti-pesticide movements, and in 1967 a group of scientists and lawyers founded the Environmental Defense Fund ( EDF ) with the specific goal of winning a ban on DDT.
Victor Yannacone, Charles Wurster, Art Cooley and others associated with inception of EDF had all witnessed bird kills or declines in bird populations and suspected that DDT was the cause.
In their campaign against the chemical, EDF petitioned the government for a ban and filed a series of lawsuits.
Around this time, toxicologist David Peakall was measuring DDE levels in the eggs of peregrine falcons and California condors and finding that increased levels corresponded with thinner shells.

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