How would the global environment of a completely urbanized city-planet be affected?

The properties of the planet's surface would naturally be greatly affected, both by the changed absorption/reflectivity and by the probable draining of any surface-exposed bodies of water. How would the weather be affected? Would this even be a concern, or would the city become enclosed and essentially become a planetary-wide artificial biosphere? If so, again, how would it be maintained both against natural degradation and malicious threats? How would waste be removed/sterilized/reprocessed?

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How would the global environment of a completely urbanized city-planet be affected?

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