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Greenhouse Gases and Climate Change

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(November 2000) Most of the sun’s radiation passes through Earth’s atmosphere to warm the planet. Earth’s surface in turn reflects this energy back toward space in the form of infrared (heat) radiation.

The Urban Demographic Revolution

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(September 2000) A report commissioned by the German government and released July 4 at the Global Conference on the Urban Future presents an upbeat view of the growth of cities in the 21st century.

Urbanizing World

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Managing urban population change will be one of the world’s most important challenges in the next few decades.

Youth and the HIV/AIDS Crisis

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(August 2000) About half of all people infected with HIV are under age 25, according to World Health Organization estimates, and in less developed countries, up to 60 percent of all new infections are among 15-to-24-year-olds.