The asteroid tugboat idea was developed by Schweickart and his team at Foundation B612.
CNN: Space's threat to civilization
Noble efforts to detect asteroid threats such as those of the B612 Foundation have received much deserved attention.
FORBES: The Moon is a Natural Platform for Asteroid Mining, Detection and Deflection
The B612 group believes such a system could be ready for use by 2015, and suggests it should be tested shortly thereafter on a non-threatening asteroid.
ECONOMIST: A large asteroid sweeps by Earth. Where are the others?
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