Energy availability is a real concern for everyone. Without energy or with access to much less energy than we currently use, we could not live in the same way, and life would not be easy. As an Sustainability Professional you will learn about this new "green" paradigm, where energy plays a central role in our lives. Building an energy future which assures ample supplies of energy to meet our needs should be a major priority and of concern to all. Energy supply is a complex subject and many considerations come into play: science, technology, the economy, politics, the environment, energetic independence, national security, and so on.