3-5 topics with a quote

1. Slavery as a form of energy. "slavery has been another tool of modern civilization, and there are some historians who assert that without slavery the Mesopotamians, Egyptians, Chinese, Romans, Ottomans, Europeans, and Americans would not have had anything close to the levels of affluence they enjoyed." (32)
2. Population Bubble; big enough to pop? "... nobody expects this rate to continue... the fact that our current growth rate cannot continue is not in dispute." (16)
3. Getting hungry, China? " When China becomes hungry over the next few years, her need for food will rock world food prices... now a goods exporting powerhouse, can raise the money to pay for her food. Food may well become the commodity well before oil dries up." (88)
4. What do you mean we're out of water? "... the human need for fresh water will outstrip the entire planet's replenishable water supply by 2025 - even before we run out of oil." (103)
5. The liver and kidneys of the planet are big trees. "... trees are even more critical to maintaining steady levels of atmospheric carbon than anybody had previously thought." (65)