Final answer:
Green economics integrates work, human needs, and the use of earth's materials, emphasizing the limited supply of resources and the necessity for sustainable development.
Step-by-step explanation:
Green economics is a field that focuses on the intersection of ecological concerns and economic activities. In this context, the correct phrase to complete the sentence would be 'work, human, materials.' Green economics deals with finding a balance between human needs and the capacity of the earth to provide resources and support life. The concept emphasizes sustainable development, which is about meeting the needs of the present without compromising the ability of future generations to meet their own needs. It integrates concerns for renewable and non-renewable resources, recognizing that the earth has a limited supply of resources, and so humans must conserve resources, not only for their own welfare but also because they share the earth's resources with other living things and are an integral part of nature.