As a lawyer, I can understand this struggle. I was lucky to have low enough student loans that I could work in government or a non-profit for the first 6 years after law school, and then was lucky enough to find a job where I could make bank by helping people. (It's a very niche area that I didn't know existed until I had my first interview.) I feel like this is the part that people don't tell you when you're taking out big loans to go to elite schools. Your choices when you get out are going to be limited if you don't want to pay off those loans for the rest of your natural life. You're probably going to have to take a job in corporate law of some sort, at least for a few years, to have a reasonable shot at paying off your debt and moving on with your life.

For me, the question is: why did you clerk at this firm to begin with? Most law students are hoping for a permanent offer after their clerkship ends, although with certain non-profits and/or government jobs, that may be an unlikely proposition. Was it the only job you could get? Did you just not research it before you got into it? Have you only recently started having a conscious objection to these companies? Can you stomach doing this job for a couple of years to pay off loans and establish yourself? Will this give you useful skills that you could then use to help others? If you left this firm to go to the EPA or other firm engaged in fighting against climate change, would your learned skills help you there? In short, can you use this experience to serve the greater good down the road? Those are the question that really need answers.