You know, I looked this up a while back when I wasn't sure that I wanted to remain a chef.
Sustainable energy and environmental sciences/planning are big and only getting bigger, both in terms of the job market (amount of people) and scope of what's out there in terms of jobs.
If you look at how the world is now, with all these various ecological issues (environmental disasters/accidents, loss of natural resources, etc.) and then just imagine what might be happening ten years down the line? There's going to be an even greater need for people with that kind of educational background.
I know if it were me, that'd be the way I'd go. Or landscaping! You're outside, lifting heavy stuff, working with your hands. I get a kick out of jobs where you get to see the fruits of your labor immediately upon completion.
Lucky son of a gun. You're making me miss school.