1. Think about the analogy of putting Earth’s history into a 24-hour day or a single year. Why is it so shocking that humans have caused so much change to the planet (e.g. climate change, plastic
pollution, population, etc.)?
2. List two lines of evidence for evolution and explain why they support the idea that all life has an
original universal common ancestor.
3. Why is the number of people that the world can support in a sustainable fashion considered to be much lower than the global carrying capacity?
4. Water pollution has a devastating effect on stream, lake, and ocean ecosystems. Give three examples of problems associated with pollution in these systems.
5. In what ways does deforestation contribute to the increase in greenhouse gases in the atmosphere?
