The publication paved the way for the "back-to-the-land movement" in the late 1960s and early 1970s.[13][14] 1962 The publication of Silent Spring by Rachel Carson marked another major milestone for the sustainability movement.[15] 1972 Donella Meadows wrote the international bestseller The Limits to Growth, which reported on a study of long-term global trends in population, economics and the environment. It sold millions of copies and was translated into 28 languages.[16] 1973 E. F. Schumacher published a collection of essays on shifting towards sustainable living through the appropriate use of technology in his book Small is Beautiful.[17] 1992–2002 The United Nations held a series of conferences, which focused on increasing sustainability within societies to conserve the Earth's natural resources. The Earth Summit conferences were held in 1992, 1972 and 2002.[18] 2007 the United Nations published Sustainable Consumption and Production, Promoting Climate-Friendly Household Consumption Patterns, which promoted sustainable lifestyles in communities and homes.[19]