Expert-reviewed information about the Earth. For everyone.
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Featured Article
Flora of Napa County, California
Napa County is a rural county in northern California encompassing nearly 500,000 acres (200,000 hectares), about 0.5 % of the landmass of the state. It is located 25 miles (40... More »
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Featured Article
Nuclear power
Nuclear power is the generation of electricity from controlled reactions within the nucleii of atoms that release energy used to boil water, the steam from which drives a... More »
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Featured Video
Jean-Michel Cousteau: use of oil dispersants...
The Rundown caught up with ocean explorer and occasional PBS host Jean-Michel Cousteau to chat about what his team discovered on dives in the aftermath of the Deepwater Horizon... More »
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Featured Article
European otter
The European otter (Lutra lutra) is a broadly distributed marine mammal found in both marine and freshwater systems over considerable portions of Europe, Asia and North Africa;... More »
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Featured Gallery
Cabo de Gata-Nijar Natural Park, Andalucia,...
Cabo de Gata-Nijar Natural Park lies along the Alboran Sea of the Mediterranean coast of Andalucia, Spain. The most arid area in the entirety of Europe, it boasts varied... More »
Redwood Sorrel
Last Updated on 2013-05-20 at 18:13
Redwood Sorrel (Oxalis oregana)
Redwood Sorrel is in the Oxalidaceae, the wood sorrel family, a relatively small family with three genera and 875 species of mostly tropical... More »
Strait of Hormuz
Last Updated on 2013-05-20 at 13:48
Located between Oman and Iran, the Strait of Hormuz (26°34'0.00"N, 56°15'0.00"E) connects the Persian Gulf with the Gulf of Oman and the Arabian... More »
Dollar Value of Ecosystem Services
Last Updated on 2013-05-20 at 05:42
The value of ecosystem services typically goes unaccounted for in business and policy decisions and in market prices. For commercial purposes, if ecosystem services are... More »
Estimation of adult human biomass
Last Updated on 2013-05-20 at 04:30
The energy requirement of species at each trophic level is a function of the number of organisms and their average mass. The study estimates global human biomass, its... More »
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