Answer questions like ...

1. Which of the following would have the biggest impact on reducing carbon emissions?
2. We produce more than 36 billion tons of carbon dioxide per year. Where does the majority of it end up?
3. In the 10,000 years before the Industrial Revolution in 1751, carbon dioxide levels rose less than 6 percent. Since then, they've risen by:

Use the green Start Show button above to start playing!