COMPARISONS BETWEEN ADJOINING countries separated by politics or economics can be instructive. North Korea’s forests have been shrinking by around 2% a year for 20 years; South Korea’s are stable. Satellite pictures of the island of Hispaniola in the Antilles show that the western side (Haiti, with a GDP per person of $771 a year) is barren, whereas the eastern side (Dominican Republic, GDP per person $5,736) still has plenty of dense forest.
Economic growth is widely believed to damage species other than man. But as the contrasting fortunes of forests (a fair proxy for biodiversity) on the Korean peninsula and Hispaniola suggest, it is not so much growth as poverty that reduces biodiversity. Poverty without growth, combined with lots of people, is disastrous. Poverty combined with growth can be equally calamitous. But once people enjoy a certain level of prosperity, the benefits of growth to other species outweigh its disadvantages.
There appears to be an environmental version of the Kuznets curve, which describes the relationship between prosperity and inequality in an inverted U-shape. At the early stages of growth, inequality tends to rise; at the later stages it falls. Similarly, in the early stages of growth, biodiversity tends to suffer; in the later stages it benefits.