<p>I don’t know this for a fact, but if you’re interested in hard science, Russian and German are supposed to be the most valuable languages. Not sure if that applies to environmental science or not. Otherwise, fluent Arabic is in relatively high demand. I took classes with someone who spoke Arabic and Farsi fluently & she was actually sought out by the FBI to work in translation. Not that that’s your interest, but it can certainly open doors if you are actually fluent. If you decide to study abroad, check out interpreter education requirements in the US. Some require 6 months of study in that country, etc. Couldn’t hurt to get that under your belt in case you ever need it. </p>