Actually it was the lawsuit against the implementation of the "Clean Power Plan" rules.  (Honestly I cannot remember what happened with that - maybe Trump scrapped it).  It is something that benefits Colorado and its reliance on clean air and water for its natural beauty and the ski industry.  

I agree with suing the EPA for Gold King Mine spill but we also need to hold our mines to account as well - or whoever last owned the abandoned mines.  I know that it gets a bit complicated with the EPA taking them over.  I am getting side-tracked.