This unit discusses resource consumption and sustainability. It covers how resources are classified as natural, human, or material. Students then identify resources from photos and classify them as renewable or non-renewable. There are three types of renewable resources: those that renew themselves without human intervention, sustainable resources that can be replenished through management, and resources that can be renewed through human efforts like wood. The document concludes with an exercise weighing the costs and benefits of tar sand oil, biofuels, and solar energy as alternative energy options for a country estimated to run out of oil in 50 years.