What Does 7 Billion Look Like?

It's hard to imagine such a large number (unless you're Warren Buffett), but the world population will soon be 7 billion strong. What are some ways that we can visualize this number? This CNN video tries to help us, just as Zephyr Teachout helped us make sense of the $700 billion doled out in government funding during the financial crisis in 2008.

Discussion Starters:

• Which of the comparisons in the CNN video help you to visualize 7 billion most easily?
• What are other ways that you can help people visualize 7 billion? Imagine that you're translating this number for 5th graders, college students, and senior citizens. What comparisons might work best for each group?