History of Environmental Health Problems
In 1948, physicist G. Gamow proposed the Big Bang Theory of the origin of the universe. He believed that the universe was created in a gigantic explosion as all mass and energy were created in an instant of time. Environmental problems have bedeviled humanity since the first person discovered fire. The earliest humans appear to have inhabited a variety of locales within a tropical and semitropical belt stretching from Ethiopia to southern Africa. These humans provided for themselves by a combination of gathering food and hunting animals. Humans learned how to domesticate animals and cultivate plants and, in doing so, made a transition from nomadic hunter gatherer to rooted agriculturalist. The global population at this time was about 4 million people, which was about the maximum that could readily be supported by a gathering and hunting way of life.