Environmental Ethics?

I am presenting a symposium tomorrow on Environmental Ethics at a local college. The symposium is being given to a group of freshman science majors and I am struggling to present something that is truly relavent.
There are so many different directions to take the presentation and so many ways to present it. My current position is to suggest to the audience that Environmental Ethics is as personal as any other ethical decisions they must make on a daily basis. Ethics is based on position, responsibility and so much more.
In a previous life I had to struggle on a daily basis with the ethics of turning an agricultural company into a potential ticking genetic time bomb or to continue to stress genetic diveresity in our hybrid corn lineup. I chose diversity and was given the opportunity to change professions, which I am most greatful for by the way. Still, most of our food sources today are at great risk because of the continued decisions to go away from genetic diversity and toward a mono-culture that could potentially cause a major disaster should some type of disease put our present crops at risk. Enough of that.
My topic tomorrow is important but must be presented with a balanced and logical approach that young minds can comprehend. Prayer is needed!