Want to become a tax attorney

Oddly, I just came across a survey that said tax lawyers are the happiest associates!! http://taxprof.typepad.com/taxprof_blog/2015/01/who-are-the-happiest-law-firm-associates-.html FYI, it also said that renewable energy lawyers were the least happy. I work in the renewable energy field specializing in tax, and think renewable energy is a great field. I take it all with a grain of salt but thought it was relevant to this thread.