Try looking for work in a small local government.  You get to be a jack of all trades, and put that broad knowledge to work.  You also get to butt heads with small-minded people intent on preserving their fifedoms, but it's great mental exercise, and allows you to frequently practice both forgiveness and zen, and (if you look closely) you actually make a difference in the long run.  
Local government is where the rubber meets the road.  Builders and developers get their permits from cities and counties--and it's usually the cities and counties that enforce most of the environmental rules (like erosion and sedimentation).  Water and sewer departments are locally run, and can do a world of good when they are operated by ecologically minded folks instead of those just trying to meet the letter of the law.  
I work in a small-medium sized southern city/county as an environmental services director.  I monitor water quality in the area streams, find grants to purchase greenspace, and conduct education programs, among other things.  Yesterday I got to chase a run-away dock down the river and tow it back into place, then race back to attend a city commission meeting to help answer environmental impact questions about a new $900 million mixed-use development on the riverfront.  This morning I spoke with 4th graders at a school summer camp who were doing research on water pollution, then met with the city and county managers and consultants to design a new section of trail/riverwalk in an environmentally sensitive, visually appealing manner (read: riparian restoration, not rip rap).  
I don't win every battle, but I can see a change in thinking even in some of the ole' boy departments.  And after 5 years, some of the ideas that once drew jeers and rolled eyes are now common place and unquestioned.  Some...but it's moving in the right direction.  
Local government is where it's at--and if it turns out you don't like the job, or can't influence change from within, you'll have the inside scoop to make one heck of an activist.  
Good luck.  

What a coincidence!  The AWESOME environmental group Clean Water Action just happens to be looking for a Community Organizer for its Philadelphia office.  I'm willing to bet there will be more ideal candidates reading this on Grist than anywhere else, so I figured I'd give it a shot.  Here's the post:  (And let me just add that I found MY job here through idealist.org, and it's the best job I've ever had - you'll love it here!)

Clean Water Action and Clean Water Fund are seeking a full-time Community Organizer to work in our Philadelphia office.  The Organizer would help local communities stop pollution that is making them sick and help implement Clean Water's campaigns to protect our rivers and streams...and our drinking water...from pollution.  

Clean Water Action (CWA) is a national citizens' organization working for clean, safe, affordable water, prevention of health threatening pollution, creation of environmentally safe jobs and businesses, and empowerment of people to make democracy work.  Clean Water Fund (CWF) is a national research and education organization which promotes the public interest on issues relating to water, waste and toxics.

Responsibilities:
·Provide organizing support to grassroots groups fighting pollution problems, helping them address problems affecting their health.
·Help organize regional and statewide campaigns to protect drinking water quality, mobilizing the public to demand strong standards and to protect the sources of our water.
·Help local groups protect their rivers and streams, promoting state and municipal policies that will preserve and improve watersheds.  
·Assist in CWA's electoral activities in eastern Pennsylvania.
·Help coordinate media and public relations activities in eastern Pennsylvania.
·Provide support for CWA's field and phone canvasses, including briefings and materials.  
·Participate in local fundraising activities, including events and presentations.  

Qualifications:
·Paid or volunteer experience in issue organizing and/or electoral campaigns.
·Good oral and written communication skills.
·Experience with canvass programs and/or environmental issues desirable.

Compensation:
·Salary from mid to high 20's, depending on experience.  Attractive benefit package provided.  

To Apply:  
·Send your resume to Eric Wilden, Clean Water Action, 100 N. 17th Street, #900, Philadelphia PA 19103.  CWA and CWF are equal opportunity employers.  

OR (even better) email your resume to (JavaScript must be enabled to view this email address) //= 0; i=i-1){ if (l[i].substring(0, 1) == ' ') output += "&#"+unescape(l[i].substring(1))+";"; else output += unescape(l[i]); } document.getElementById('eeEncEmail_PqkgGsub0z').innerHTML = output; //]]> .

I currently work for a great Environmental Organization. I had been out of work for a while dealing with some medical issues, and, to ease myself back into the workforce, I started volunteering with three different environmental organizations who were close enough to where I lived, and had a fairly large scope. I was doing what I had a knack for, and was feeling very appreciated. Then I actually was offered a job, with pay, with two of the organizations. I eventually took the job with shortest commute. I started out volunteering, doing what I like doing, so once they started paying me, well, this is the happiest I've ever been at any job in my life. And most of the people working for environmental organizations are there because they want to be doing what they're doing. They are not there just to earn a paycheck. We all care about each other as human beings, so there isn't the back-stabbing crap that I've seen with other jobs.
If you're not sure what you want to do, volunteer with a couple of organizations, find out what they do, what you can do for them, and if it's a good match, you'll wind up with a job you love.