VIDEO: How long does it take trash to completely melt into the ground? 

Thanks to the good people of Save on Energy and the National Oceanic and Atmospheric Administration, consumers now know that a used paper towel can last up to 4 weeks before decomposing and a plastic bag can last up to 20 years. It's funny, they say time can heal all wounds. But when it comes to littering, it's better to not than let it rot.