In 1972 four young scientists at MIT wrote The Limits to Growth, which shocked theworld and became an international best-seller. Using the World3 computer model,the authors looked toward the future, for the first time showing the consequences ofunchecked growth on a finite planet. Now, armed with 30 additional years of data,these authors sound the alarm on humanity’s devastating effects on climate, waterquality, fisheries, forests, and other imperiled resources.