What are the three key concepts for this section? Define environment. Distinguish among environmental science, ecology, and environmentalism. What is an ecosystem? What are three scientific principles...

What are the three key concepts for this section? Define environment. Distinguish among environmental science, ecology, and environmentalism. What is an ecosystem? What are three scientific principles of sustainability derived from how the natural world works? Define solar energy, biodiversity, and chemical cycling (or nutrient cycling) and explain why they are important to life on the earth.