piece four

As time passes, the amount of gases such as chlorofluorocarbon and carbon dioxide increases due to vehicle exhaust and electricity. These gases, along with others, trap heat and contribute to the presence of greenhouse gases on Earth. As more time goes by, you have more gases like chlorofluorocarbon from vehicle exhaust, carbon dioxide from electricity, and the gases mentioned earlier continuing to trap gases, allowing for more greenhouse gases to make itself present on Earth.