One unfortunate aspect of our quest for technology is our indifference to the vulnerabilities that can come with advances. You probably don't think of it very often but the very functioning of our societies has become dependent on satellites. We're dependent on them for everything from essential communications to global security to weather tracking to navigation and shipping.
As our dependency on satellites has increased, so has their number. The earth is now blanketed by 13,000 of them. Google Earth has produced a brief animation giving you an idea of what this reality looks like.
There's only one snag to all of this and that lies in the mathematical certainty of what is known as the "Cascade." Sooner or later there will be a catastrophic collision between two of these satellites that will generate hundreds or thousands of projectiles that will explosively impact with another satellite and then another and then and increasing number until a critical mass is reached at which the entire satellite web is destroyed.
This isn't a possibility, it's a mathematical certainty. Ask NASA. They know it's a certainty, utterly inevitable, and they know we have no means to prevent it.
Bad as it may be, the loss of our satellites isn't the worst part. The debris field that remains is the greatest problem. It will prevent us from re-establishing satellites for upwards of 60-years. In other words, man will be denied access to space for three generations.
Maybe we'll do better next time.