questions are from , documentary film - "An Inconvenient Truth."
1 Name the four spheres of the Earth (not the hemispheres!). Of these, which one(s) do humans have the most impact on, and why?
2 What is the role of vegetation distribution in how carbon dioxide fluctuates annually?
3 What does Lonnie Thompson use to measure past CO2 and O2 levels?
4 Describe the relation between CO2 levels and temperature through time.