The metaphor is so obvious. Easter Island isolated in the Pacific Ocean — once the island got into trouble, there was no way they could get free. There was no other people from whom they could get help. In the same way that we on Planet Earth, if we ruin our own [world], we won't be able to get help.
Jared DiamondTake air quality in the United States today: It's about 30 percent better than it was 25 years ago, even though there are now more people driving more cars.
Jared DiamondRecent discoveries about apes suggest, however, that a gorilla or common chimp stands at least as good a chance being murdered as the average human.
Jared DiamondOne way to explain the complexity and unpredictability of historical systems, despite their ultimate determinacy, is to note that long chains of causation may separate final effects from ultimate causes lying outside the domain of that field of science.
Jared Diamond