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Your source for incisive, peer-reviewed articles that bring the insight and authority of our panel of experts and authors to bear on the most important ideas for creating a sustainable future.

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The Millennium Ecosystem Assessment (MEA) identified many services provided to humans by nature, termed ecosystem services (ES),1 and demonstrated that these services make major contributions to improving human well-being. More recently, the Economics of Ecosystems and Biodiversity (TEEB) study advocated that ecosystem services should be measured and valued to facilitate their inclusion into decisions.2 The importance of this inclusion was first articulated by Costanza et al., who valued global ecosystem services at about 30 trillion dollars per year, that is, approximately twice the global Gross Domestic Product (GDP).3

Life is divided into six kingdoms. In order of increasing complexity, these are bacteria, protozoa, chromista, fungi, plants,...

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As I wandered through the streets of Caracas on my first trip to Venezuela nine years ago, a huge urban farm in the midst of concrete high-rises caught my attention. It wasn't tucked away on a side street or in a residential area, but was right out in the middle of the bustling downtown. I asked a local walking by if he could tell me anything about the farm—whose initiative was it, how long had it been there, who farms the land? With a matter-of-fact shrug he said, "Es parte del proceso." It's part of the process. Part of what process, I wondered. Did he mean Venezuela's broader process of political and social transformation, the Bolivarian Revolution? Or did he mean the efforts to transform Venezuela's food system? Later, I would learn that the two concepts were inseparable...

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Unconstrained free markets by their nature pose a threat to the natural environment. Few people believe that without regulation of these markets, the environment can avoid irreparable damage....
A recent global assessment by hundreds of scientists, the Cities and Biodiversity Outlook (CBO) examined how the coming massive global urban growth will interact with the natural world.1 By 2030,...
Nothing has been more influential in shaping the United States and the world in the first decade of the 21st century as the terrorist attacks in New York City on September 11, 2001 (9/11). As a...

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Environmental security has taken on new meaning in the twenty-first century as sustainability and natural resource...
The pathway for conversion to a renewable energy future has been pioneered by Denmark and a few other visionary nations. But...
If the United States intends to meet the Department of Energy’s goal of producing 20 percent of the nation’s electricity...
I fully agree with the idea that world population growth can—and should—be reversed through fertility rates that fall below...
The Guttmacher Institute provides estimates, covering various years in the last decade, of the proportions of all...