Methane gas, a strong greenhouse gas, can build up inside the landfill leading to an explosion unless released from the cell.[4] Leachate are fluid metabolic products from decomposition and contain various types of toxins and dissolved metallic ions.[5] If leachate escapes into the ground water it can cause health problems in both animals and plants.[6] The volatile organic compounds (VOCs) are associated with causing smog and acid rain.[7] With the increasing amount of waste produced, appropriate places to safely store it have become difficult to find.