Confidence votes 4.4K. Harmful Effects on the Ecosystem: Pollution of Land Improper disposal of waste from homes, offices, hospitals, stores and factories causes garbage to pile up.Open dump sites destroy the beuty of a place. They also provide breeding places for rats and flies, which are harmful to people.onfidence votes 4.4K. Harmful Effects on the Ecosystem: Pollution of Land Improper disposal of waste from homes, offices, hospitals, stores and factories causes garbage to pile up.