Aside from creating a bit of turbulence around the outer sections of the blades, they don't physically do anything. Air being a gas, flowing around obstructions has no effect whatever on it.
OTOH, they do tend be to obnoxiously noisy because of the turbulence.
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No, a planet without an atmosphere cannot have a greenhouse effect because the atmosphere is necessary to trap heat and create the warming effect. Without an atmosphere, there is no mechanism to retain heat and create the greenhouse effect.
The Greenhouse Effect.
EarthVenusMarsThe greenhouse effect occurs on every planet with an atmosphere (including Earth). On Venus, there is a runaway greenhouse effect causing temperatures high enough to melt lead.Mars has a greenhouse effect that is weak because of its thin atmosphere.
hobby buzzards
Windmills extract energy from the wind whenever the wind is blowing. Day or night, Summer or Winter.