Currently, no satellite orbiting Earth is at significant risk of colliding with other satellites or satellite fragments, but the risk of such a collision is likely to increase dramatically in the future  After all, once such a collision occurs, it will probably produce thousands of satellite fragments, each large enough to shatter other satellites
The resulting collisions will produce many more fragments, and so on, causing the space around Earth to become quite heavily cluttered with dangerous debris
It is a claim that serves as the argument's conclusion.