The demand for environmental scientists and hydrologists is expected to increase because of a(n) a. increased demand for natural resources; need to create environmental laws to protect natural resources for human consumption; need to develop air quality control systems for big business; need to ensure proper disposal of human waste b. increased demand for natural resources; need to enforce environmental laws and regulations; need to analyze human impact on the environment and to invent ways to restore it; need to ensure proper disposal of human waste c. decreased demand for natural resources; need to analyze impact of invasive species on the environment and to invent ways to preserve it; decrease of man-made reefs and their impact on oceans; need to develop sanitation systems d. decreased demand for natural resources; need to enforce environmental laws and regulations; need to develop sanitation systems; need to create environmental laws to protect natural resources for human consumption