Answer:
is when it contributes towards the contamination and destruction of natural habitats and the wildlife that live in those habitats by exposing them to harmful chemicals that would otherwise not be present over the natural course of things
...asteroids and comets. Planets formed much later.
Remember the saying,
<em>"Give a man a fish and he will eat for a day, teach a man how to fish and he will eat forever"</em>
Well the Gopniks in Russia wrongly translated with saying to: teach a man how to become a fish and he will eat forever. So during the 1970-90s the gopniks all gathered near the lakes in order to satisfy their famine from communist regime. Unfortunately humans can not breathe under water so, fisherman in present day are still recovering bodies from the bottom of these lakes of these gopniks. Thousands still remain in lakes across this nation.