re: Using condensation to gather drinking water in Ethiopia

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would it change the climate?

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You're probably asking whether it would change the local ecosystem, not the "climate" which would be a larger-scale regional (or global) scope.

Resources are finite. To answer the question of whether these structures would change the ecosystem, ask the question "Would having these structures scattered over Ethiopia lower ambient water vapor in the atmosphere to the point that there is a shortage of water vapor at another point where it is needed?"

You could get away with structures like that in places with high humidity and probably not change the ecosystem, but in an arid or semi-arid environment you may be creating artificial shortages that effect something in that ecosystem.