@emtbasic - You're right about it being a growth industry. Pretty much every company that makes things in the U.S. is doing this kind of analysis now.
I write life cycle analysis software, and we have been very busy lately, even in the bad economy. Everyone either wants or needs to be right on top of how their processes and products can harm the environment. Some do it out of a sense of responsibility, some do it because they don't want to get fined or sued by the EPA.
Either way, I have job security for a long time to come. Even though every project is different, with well-written software you can model the outcomes of most common manufacturing processes. You just need smart people to interpret the data when you're done.