What is the key concept for this section? List three ways in which scientists study ecosystems. Explain why we need much more basic data about the condition of the world’s ecosystems. Distinguish...

What is the key concept for this section? List three ways in which scientists study ecosystems. Explain why we need much more basic data about the condition of the world’s ecosystems. Distinguish between the Holocene era and the proposed Anthropocene era. What is a planetary boundary (ecological tipping point) and why are such boundaries important? List four boundaries that we may have exceeded. What are this chapter’s three big ideas? Explain how tropical rain forests (Core Case Study) showcase the functioning of the three scientific principles of sustainability.