Poor Trump.  He lives in his fantasy-land with no real clue what's going on in today's world.  Pittsburgh is definitely not what it used to be back in the steel industry era (I grew up in Bethlehem, PA, so I have a good idea what a steel town was).  I went there a few years ago (my FEA program company was originally from there), and it's cleaned up and high-tech as the article states.

Oh, for those claiming that China is exempt from the Paris accord, that's bull.  In fact, not only are working hard on ensuring they meet the 2030 levels, they seem to be well ahead of schedule.  Below is a link to a very good article explaining what the rules are and how they differ for developing nations vs. developed nations, along with both our stats and China's.

http://www.factcheck.org/2017/03/pruitt-paris-accord/