With respect to five "policy-relevant" characteristics or questions: Is it a stock-flow or a fund-service resource? Is the resource excludable or nonexcludable? Is the resource rival or nonrival? Is the resource rival or nonrival between generations? Is this resource substitutable? I need to demonstrate an understanding of these "policy-relevant" characteristics by applying them to a specific type of resource: solar energy. Specifically, for your chosen resource "solar energy", take each of the five "policy-relevant" questions above, in turn, and provide two types of information: First, answer the question for the resource (solar energy) and briefly explain your answer. Then explain, why and how this is a "policy-relevant" characteristic for the resource: solar energy. I may use a specific policy question or example. How does this characteristic impact what can or can't be done from a policy point of view? Similarly, it may be helpful to think of this within a source and sink context. The global ecosystem is the source for all types of resources and the sink for the waste and by-products that result from their use in the economy. There are many sustainability policy implications for these two contexts, and the listed "policy-relevant" characteristics shape the types of policy actions that will be possible and/or effective.