Green/Enviornmentally Conscious "Trend"?

In my business and professional communication class we were asked to invent a product or service and pitch it to the class using Monroe's motivational sequence. I was actually a little bit surprised by what some of my classmates came up with:

More than fifty percent of the class came up with some product or service that improved gas mileage, helped you recycle, or was in some way, good for the environment. Some of the products were far fetched (like a flying car). and some were a bit more novel and simple (like a glass refrigerator so you don't have to open it to see what is inside). About %30 percent of the products reduced fuel consumption, like an exhaust compressor that turns the unburned exhaust gas back into fuel.

These products are all interesting, but the common marketing trend is very clear and potentially useful. The way that fifty percent of the students marketed their products involved sustainability and a kind of scare tactic that we are killing the earth. The marketing implications of this are very clear; people do not want to kill the earth. I think it will be good to keep this in mind as I start my career.