As we do not have access to the lessons that this question refers to, we cannot answer that part of the question. However, we can still discuss the other sections of the question.
I am optimistic about the future of U.S. energy and environment. This is because I am able to see many movements and changes in the present that point towards a future that is more promising and more responsible. Renewable sources of energy such as solar, wind and geothermal are becoming more important in our country. They are cheaper and more common than in past years. Moreover, institutions such as EPA have passed legislation in recent years that is designed to protect the environment of our country from degradation.