Sustainable Classroom Projects?

shortyadamk writes: "I just started a new job where I will have to visit many high school science classes and have the students participate in 1-3 day projects regarding sustainable energies and environmental sciences (in order to promote the regional universities programs). I've looked at a number of the boxed projects available online and many of them are solar projects...My biggest issue with that is that we are in rural Alaska and much of the time I'll be visiting classes will be in the winter (when we have very little sunlight and even if we did it would be too cold to go and play in). I'm curious if anyone has any ideas or suggestions for demonstrations and projects that can be done in the classroom and do not require sunlight. One other catch is that the project has to be small enough to fit in a suitcase or plastic tote, we don't have any roads connecting the villages so I will have to fly the project from school to school with me."