The World's Biggest Problems | The Arlington Institute: "Petroleum has powered the modern world for almost 100 years; today, many industry insiders say that we may be reaching a permanent peak in oil production.
Global Water Crisis : Over the last 50 years the human population has nearly tripled, while industrial pollution, unsustainable agriculture, and poor civic planning have decreased the overall water supply.
Species Extinction : Certain species that human beings depend upon for our food supply are going extinct; if their numbers fall too low we may face extinction ourselves.
Rapid Climate Change : While the debate rages on about the causes of climate change, global warming is an empirical fact. "
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