Just over 30 years ago a path-breaking book was published called The Limits to Growth. It posited the then controversial idea that unlimited growth on a finite planet would inevitably lead to ecological collapse. The book became a surprise international best-seller and was translated into more than a dozen languages. In 1992 Chelsea Green published Beyond the Limits bringing the data and the systems analysis up to date. Now Limits to Growth: The 30 year Update takes the analysis into the first decade of the 21st century to show that while the situation remains precarious, there is still time to bring the Earth back from the brink of ecological collapse.