Anyway, this is already done, at the whim of the teacher. My brother teaches math, and learned that they were repaving the highway in front of the school, about an 8-mile stretch. Using the concepts of estimation, the metric system, multiplication, measuring, and a few other random items, he had the students figure out how much it would cost to paint the lines on the road.
(This included internet research into the type of paint used, including that cool reflective stuff)
Then he called up the township, got the real numbers, and had them do a comparison.
When I taught at an inner city school, I had the kids do an environmental project. They interviewed the school board and janitors to find out the last time the air vents and water pipes had been cleaned. They wrote letters to the EPA and other agencies to get sent free test kits. They tested for airborne particulates, asbestos, lead, etc. Then they wrote up the results and presented them to the school board.
Two months later, the air ducts got their first cleaning in 12 years.
This sort of learning is already out there, and is limited only by the creativity of the teacher.