Littering -Attracts pests and organisms and gives breeding ground for animals which can carry diseases aka vectors
Destroying ecosystems - Destryoing forests for construction of buildings
Use of fossil fuels - Destroys ozone layer which causes global warming etc
Killing of animals - Humans don't keep limits when they kill animals, they effectively wipe out species and affect food webs and chains
Pollution of waterways with factory waste - Causes the poisoning of the sea life which kills the organisms and when humans consume the fish and whatnot we ingest these toxins
