Slide 10: As the need for energy has increased, new technologies were developed to meet the need. However, each of these energy producing technologies has brought with it disadvantages as well. Coal, while it is abundant, produces air pollution and acid rain and an increase in CO2 emission. The combustion of oil and its by-products also increases CO2 levels and causes air pollution. The world's supply of oil is finite. Natural gas burns cleanly but is in limited supply and also produces some CO2.
