I guess my biggest concern is the viability of pursuing a PhD in economics without having a previous degree in econ. I have a BS and MS in environmental science and an MPA in energy policy/economics. I think I have stronger scientific chops than many economists, but I don't know how valuable that actually is.
Also, it seems to me that the general market for energy economists is very strong, and will remain that way for quite some time. Do you think that's accurate?
I love plowing through data and developing methods and analysis to try and draw out relationships and show why things are what they are. I know that sounds incredibly vague, but as far as I can tell economics is the field that most closely aligns with this in the context of energy and the environment.