Tending to contaminate.

adjective. That contaminates

adjective. making impure by contact or mixing

"GMOs on the contrary are contaminative, unfriendly to our biodiversity, and pose a threat to the existence of our indigenous seeds, to organic farming systems, and to human and animal health in general."

elevating  

infected  septic  

corruptive  defiling  depraving  infectious  infective