Environmental scientist
"Oooh... what's that then?"
"Cool, what do you want to do with that?"
"What do you think of (insert controversial topic, e.g. fracking, organic farming, climate change, ocean acidification, etc) then?" (and try and lure me into a debate which has nothing to do with anything or how environmental protection's useless...grrr....)
"So you're a tree hugger then?"
"Do you just study global warming?" Nope, we do everything. Law, economics, sustainable development and statistics to whales, the genetics of bumblebees and the sex lives of jellyfish.
"I hated science at school."