U.N. report warns environment is at tipping point

RIO DE JANEIRO (AP) – The earth's environmental systems "are being pushed towards their biophysical limits," beyond which loom sudden, irreversible and potentially catastrophic changes, the United Nations Environment Program warned Wednesday.

New index shows lower growth for major economies

Nina Chestney

RIO DE JANEIRO, (Reuters) - Some large economies show significantly lower growth when natural assets such as forests and water are factored into growth indicators, an index showed on Sunday, a few days before an international sustainability summit starts in Rio de Janeiro.

The Top 10 Smart Cities On The Planet

Boyd Cohen

Crunching a list of variables about innovation and sustainability, we rank the world’s smartest cities, from New York to Hong Kong (and with an unexpected winner)

Slide Show: The World's 10 Largest Renewable Energy Projects

Christopher Mims

Today, renewable energy sources generate 12 percent of electricity in the U.S. But wind, wave, sunshine and others represent more than 93 percent of the energy the country could be producing, according to the Energy Information Administration of the U.S. Department of Energy.

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