With the advent of space exploration the newest form of man made disaster is pollution in space. As we continually launch satellites into orbit, the common sense by product is the trash that is generated from deactivated and broken satellites, and other debris that is created from human technology in space.
The trash humans have created in space is immense. There are thousands of floating junk orbiting the earth that makes traveling in the Space Shuttle a hazardous adventure. The below video explains how the government has an entire agency dedicated to tracking the debris in space and how dangerous it is for space travel.
You can learn more about space junk at NASA.