What is the most efficient way of reducing the temperature of a planet?

As you might know, most planets that have atmospheres are not the ideal temperature to live on. For example, Venus is a very, very, very hot planet with constant volcanic eruptions and especially the greenhouse effect. I was wondering if there exists any practical way to 'cool off' the planet.

Obviously, you cannot eject the excess temperature through space (there has to be something for the heat to transfer through). What is the most efficient (and not ridiculously expensive) material to heat up and then eject into space to remove heat?

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What is the most efficient way of reducing the temperature of a planet?

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