Some of the sites have areas where you may calculate ways in which to reduce your footprint. Skim through some of the features and look for 3 realistic, inexpensive ways a college student can reduce their individual carbon footprint. Explain the actual cost involved in each task (time or cash). For example, planting trees or spreading mulch with a local preservation group or school would not cost me any cash however, I would need to spend 2-4 hours of free time volunteering. The sites: https://www.carbonfootprint.com/calculator1.html http://coolclimate.berkeley.edu/calculator