make planets that are domed breathable?  I always start low tech and have never gotten up to having all-tech by the time I'm destroying or being destroyed.  I recently started a new race/planet mix and it is much more challenging.  As a result, what do I research to get tech to transform atmosphere to my race's type?  Planet Utilization?  I have researched this about 3 tech levels and have only gotten facility that changes conditions...  Please help me out  
 
Jason2