to promote more economic activity in the United States. Because of this policy, Reagan refused to renew the Clean Air Act during his administration. Reagan lessened existing regulations on pollution, cut funding to government environmental agencies, and appointed known anti-environmentalist individuals to key positions presiding over these organizations. When Reagan took office in 1981, he "attempted to reduce" money that was directed towards studying the burgeoning field of global warming and human-driven climate change. In the early 1980s, the study of the intersection between human activity and climate change was still in its infancy and scientists were far from a consensus on the topic. In 1987, the Reagan administration signed the Montreal Protocol in an effort to reduce emissions that damage the ozone layer. Mass surveillance Citing national security concerns, the president's national security team pressed for more surveillance power early during Reagan's first term. Their recommendations were based upon the premise that the federal government's intelligence and counterintelligence capabilities had been weakened by presidents Carter and Ford. On December 4, 1981, Reagan signed Executive Order 12333. This presidential directive broadened the power of the government's intelligence community; mandated rules for spying on United States citizens, permanent residents, and on anyone within the United States; and also directed the Attorney General and others to create further policies and procedures for what information intelligence agencies can collect, retain, and share. Foreign affairs Escalation of the Cold War Reagan escalated the Cold War, accelerating a reversal from the policy of détente which had begun in 1979 after the Soviet invasion of Afghanistan. Reagan feared that the Soviet Union had gained a military advantage over the United States, and the Reagan administration hoped that heightened military spending would grant the U.S. military superiority and weaken the Soviet economy. Reagan ordered a massive buildup of the United States Armed Forces, directing funding to the B-1 Lancer bomber, the B-2 Spirit bomber, cruise missiles, the MX missile, and the 600-ship Navy. In response to Soviet deployment of the SS-20, Reagan oversaw NATO's deployment of the Pershing missile in West Germany. The president also strongly denounced the Soviet Union and Communism in moral terms, describing the Soviet Union as an "evil empire." Despite this heavy rhetoric, the Reagan administration continued arms control talks with the Soviet Union in the form of "START". Unlike the "SALT" treaties of the 1970s, which set upper limits on the size