In September 1949, Clement Atlee announced that an atomic explosion had occurred in the Soviet Union, which signalled America’s atomic monopoly was over sooner than expected. ‘Race for the H-bomb’ looks at the impact of Soviet atomic capabilities. The United States moved slowly at first to articulate a coherent strategic policy linking military planning to foreign policy objectives. Few had thought seriously about how to wage an atomic war, should the need arise. Stalin's general reaction was one of indifference, which was useful politically and diplomatically, but intentionally masked reality. Popular opposition to nuclear energy first emerged shortly after the atomic bomb was built, but significant anti-nuclear opposition did not emerge until the 1950s.