Humans seem to create a mess wherever we go. We have a special group at NASA to tracking the bits we leave in space:

The NASA Orbital Debris Program Office is located at the Johnson Space Center and is the lead NASA center for orbital debris research. It is recognized world-wide for its leadership in addressing orbital debris issues. The NASA Orbital Debris Program Office has taken the international lead in conducting measurements of the environment and in developing the technical consensus for adopting mitigation measures to protect users of the orbital environment. Work at the center continues with developing an improved understanding of the orbital debris environment and measures that can be taken to control its growth.

At what point is space junk a business opportunity?

(See also: NASA Orbital Debris Program Office)
(See also: Wikipedia: Space debris)
(See also: SPACE.com)
(See also: BBC: Space Junk)
(See also: UCAR: Space Junk Game)