The predominant factors resulting in the warming of the earth are the emissions of CO2 and deforestation. CO2, which damages the ozone layer, comes from several sources, but the most problematic are those coming from the burning of fossil fuels from power plants. This releases thousands of tonnes of CO2 into the atmosphere every year. Another cause of these emissions is the burning of gasoline for transportation, which continues to increase because of our demand for cars and also our increasing worldwide consumption, resulting in an increasing need to transport goods. Also, forests store large amounts of carbon, so deforestation is causing larger amounts of CO2 to remain in the atmosphere.