Pollution

Pollution was the insertion toxic or otherwise contaminant materials into an environment. It could take the form of chemicals, or energy such as radiation, noise, heat or light. An ecosystem could be damaged or destroyed when exposed to pollution.

When visiting 20th century Earth in a time travel accident, Quark could not believe that humans would detonate nuclear fission bombs within their own atmosphere, polluting their planet. 

The Malons built an entire industry devoted to the disposal of industrial byproducts such as antimatter waste. This hazardous waste was dumped into open space.