These programs can either retrain workers to use the new equipment or give them a head start on a new career of their choice. Since the Industrial Revolution, America has greatly increased its contribution to global warming. This era can be noted as the beginning of the emission of greenhouse gasses that are generated completely by humans. Currently, the United States alone contributes 25 percent of the carbon dioxide emitted into the atmosphere. Large industrial plants are the main source of these greenhouse gas emissions.
Carbon dioxide is the most abundant greenhouse gas in the atmosphere.
It is released by the refining and combustion of fuels such as oil and coal. In the atmosphere, carbon dioxide blocks atmospheric windows which allow heat from the sun to escape after being reflected and radiated from the Earth. When the atmospheric window is blocked, the sun's heat is reflected back down to Earth in turn, warming it, creating a phenomenon known as global warming. The effects of global warming vary. Virtually every area of the Earth will be affected differently.