Re: Are single climate/habitat worlds really possible?
I have to disagree. If the climate is suitable for humans and if there are massive amounts of food and water, there will be bugs, rats and similar vermin, which means there will also be spiders, cats and similar predators. Unless you make a specific, concerted effort to eliminate them (or contrive some inherent technological reason to exclude them) any planet with that much activity will have riders, guaranteed.