Carson's most direct legacy in the environmental movement was the campaign to ban the use of DDT in the United States (and related efforts to ban or limit its use throughout the world). Though environmental concerns about DDT had been considered by government agencies as early as Carson's testimony before the President's Science Advisory Committee, the 1967 formation of the Environmental Defense Fund was the first major milestone in the campaign against DDT. The organization brought lawsuits against the government to "establish a citizen's right to a clean environment," and the arguments employed against DDT largely mirrored Carson's. By 1972, the Environmental Defense Fund and other activist groups had succeeded in securing a phase-out of DDT use in the United States (except in emergency cases).