I went to school for a science major (chemistry). Left with a quarter to go (12 credits short) to go to work in a record store. Ended up in a highly compensated executive position in the music industry. Napster came along... poof. Adapt and change. Now I'm in the financial services industry. Along the way I've been a buyer, a salesperson, a marketer, an operations manager, a head of IT and a myriad of other functions. As long as you have initiative you can do whatever you want to, degree or not. At this point I'll probably never get back where I was from an income standpoint and I don't care because I've found a level of comfort where I am and it's good enough for now.
As to global warming my scientific training leads me to believe there's a strong likelihood it's real based on the ever growing consensus of the scientific community. It was the politicians who poo-poo'd the idea for a long time and now even they are coming around. The scientific community has been wrong before. They, like everyone else once thought the world was flat. They've also been right before, creating most of the technological advances known to mankind (and possibly helping to lead us to this point along the way).
While the world wont burn up during my lifetime (and I have no children of my own), if there is a likelihood it's real are we willing to let it go and leave it to the next generation (your kids) when it may be too late? It's interesting observing the balance between greed, responsibility and morality.