Answer:
Landfill are referred to as dump sites. They usually contain toxic wastes which could be in the form of greenhouse gases, toxic chemicals etc.
When poisonous chemicals accumulate landfills they can easily leak into the soil and deep into the water bodies surrounding or close to the area. When this happens the organisms in the waterbodies are at risk of death due to poisoning. This could lead to scarcity of marine food for humans and environmental imbalance.