Re: Are single climate/habitat worlds really possible?
Yes, a friend of mine had a nasty idea. As it turns out, there are many species of insect that are resistant to vacuum. He recalls several that survived exposure to the vacuum chamber inside an electron microscope. So it probably would not be out of the question to genetically engineer an insect that had a self-contained breathing system which could activate upon exposure to vacuum.
Then there is the Bombardier beetle. it's jet can be adapted into acting as a space propulsion system.
Now, combine that with organic diamond tipped jaws, prolific reproduction, and an instinct to seek out spacecraft's radar dishes, sensors, and other vulnerable items, and you have a real ugly biological weapon.