What is the key concept for this section? What makes the current atmospheric warming problem urgent? Define climate change tipping point and give three examples. Summarize the possible effects of a...

What is the key concept for this section? What makes the current atmospheric warming problem urgent? Define climate change tipping point and give three examples. Summarize the possible effects of a warmer atmosphere on arctic sea ice and land-based ice. How can permafrost and tropical wetlands change and affect climate? How are sea levels changing and what are six harmful effects of sea level rise? Define ocean acidification and explain how and why it is occurring. Explain how atmospheric warming, global drought, extreme weather, and an intensified water cycle are related. Why is Alaska a bellwether of climate change? What are the possible effects of climate change on biodiversity, food production, human health and economies, and national security? Pick three of these effects and explain how each can become part of a positive feedback loop leading to increased climate change.