1. In what year did the global population reach 7 billion?

2. Of about 10 million species of insect on Earth, roughly what percentage of these are species of beetle?

3. Known throughout the world as an environmental leader, Costa Rica generates more than 99% of its electricity using renewable sources. The vast majority of this renewable energy comes from what source?

4. How many trees are cut down worldwide each year?

5. What natural phenomenon causes trees to “scream”?

6. Globally, approximately how much paper is being recycled?

7. Roughly 1 to 2 bird species are lost per year, but approximately how many bird species are there in total?

8. What is the name of the boundary in the atmosphere where weather occurs?

9. How many litres of water are required to make cotton T-shirt?

10. What percentage of known species on the planet are considered at risk from extinction?