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Converting atmospheres- Is it worth it? What techs, and how many points of resarch do I need to get it?
In a word, yes. However, its far more economical to conqure a race that can breath the atomsphere of the planet.
AC's are a great tool for planets or moons without atomspheres. I place AC's on all moons and non atomsphere planets I colonize.
They take 20 + turns to convert, but once they do, they are very valuable. I only use the AC's on small planets and moons because they are non valued, and I can aford to wait the time it takes to convert them. Once they are converted, the pay off is makes up for the wait and cost.