On August 6, 1945, the United States used a massive atomic weapon against Hiroshima, Japan. Three days later, a second bomb was dropped on the city of Nagasaki. During the first two months of the bombings, their acute effects killed between 90,000 and 166,000 people in Hiroshima and between 60,000 and 80,000 people in Nagasaki. In the months and years that followed, the very painful effects of those days in history still lingered. All humans who survived the explosion were exposed to radiation. About forty-five percent of the 280,000 people who survived the exposure were still alive sixty years later. This highlighted the significant damage that radiation exposure could cause to people. Once it was understood that such a colossal type of radiation exposure could underdevelop children, increase long-term cancer risks, and exponentially damage cities and forests, environmentalism moved from 'a simple concept to an active movement. With Japan capitulating and within striking distance, Americans welcomed peace while Robert Oppenheimer and others worried about the consequences of relying on atomic energy. Shortly after the war, Oppenheimer warned: "We have created a thing, a most terrible weapon which has abruptly and profoundly altered the nature of the world...a thing which, by all the standards of the world in which we grew up, is a evil thing. » Almost all Americans, including him, believed that the "evil thing" had brought peace in 1945, but no one knew what it would bring in the future, although everyone knew it would inevitably shape the world to come, as is indeed the case. This catastrophic event of World War II undoubtedly marked the moment when environmentalism truly began to emerge, and subsequently, several political, economic, and ecological factors took shape...... middle of paper . ..... determining factor in human affairs, and the nation as a whole has done a remarkable job in keeping the green movement alive. The fact that we are now much more likely to call on scientific data and experimental research to support our arguments for protecting wilderness or against polluting industries gives us more power to think properly and implement ecological support systems. Politicians record the work of multiple researchers and use automated climate models to combat global warming, while medical researchers rely on public health statistics to argue against mercury pollution and other harmful elements . However, whether these arguments succeed or fail, the vast achievements of the green movement still depend on the vision, passion and commitment of not only environmentalists, but also the majority of people on planet Earth..