I realise this is an old thread but I was interested to see this report in The Guardian on Saturday:
Rise in space junk could lead to armed conflict, says scientist
Apparently there is a huge, and increasing, amount of space junk hurtling around earth and if any of it collides with and destroys a country's military or other strategic satellite it could lead to suspicions of that another country has done it deliberately - thus creating a potentially dangerous situation. In 2013 a Russian satellite collided with debris created by China shooting down one of its old satellites, and Nasa's space shuttle has also been struck several times.
Estimates suggest there could be half a billion fragments ranging from one to 10 cm and trillions of even smaller particles.
Humans appear to have a yearning for discovery and adventure which can never be satisfied. Personally, I think we should make sure all our people here have the basics to live a reasonable life rather than spend vast amounts of money to pollute space in the same way as we have been polluting our own planet.