Which is a true statement about the levels of development approach? Terminology based on this approach includes concepts such as developed nations, developing nations, less-developed nations, and underdevelopment. This approach brought about a speedy end to underdevelopment across the globe by exploiting natural resources through industrial development. The concepts of underdevelopment and underdeveloped nations emerged out of the U.N. Conference on Environment and Development in Rio de Janeiro, Brazil (the "Earth Summit"), in 1992. By the 1970s, this approach improved the gross national incomes of all the underdeveloped countries in the Southern Hemisphere, thereby reducing the poverty of the low income people in those countries