The decomposition process of petroleum plastics in landfills emits methane gas into our atmosphere for approximately one thousand years. Methane gas is four times more toxic than what comes out of the exhaust pipe of an automobile. Once in our atmosphere methane gas oxidizes to carbon dioxide gas. Carbon dioxide gas has a half life of seven years, which means it will remain for many years after the oxidation process. Carbon dioxide gas retains heat at twenty times the rate of oxygen. This can be an influence on the changing weather patterns of the planet.
In addition to petroleum plastic contaminating our soil and underground water sources for centuries, many countries continue to incinerate plastics.
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Dioxins float in our atmosphere for thousands of miles. They eventually settle in our soil, water, grass, and crops.