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Cleanup continues, and a portion of the oil pipeline has reopened as experts investigate the cause and impacts of last week’s oil spill.
Without keystone species, the ecosystem would be dramatically different or cease to exist altogether. Some keystone species, such as the wolf and lion, are also apex predators. The role that a keystone species plays in its ecosystem is analogous to the role of a keystone in an arch. While the keystone is under the least pressure of any of the ...
This is not a complete list of all pipeline accidents. For natural gas alone, the Pipeline and Hazardous Materials Safety Administration (PHMSA), a United States Department of Transportation agency, has collected data on more than 3,200 accidents deemed serious or significant since 1987.
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Fire is the dominant type of disturbance in boreal North America, but the past 30-plus years have seen a gradual increase in fire frequency and severity as a result of warmer and drier conditions. From the 1960s to the 1990s, the annual area burned increased from an average of 1.4 to 3.1 million hectares per year.
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When TIME’s photo department got together to create our annual list of the year’s top 10 photos, we first had to tackle the definition of an influential photo. Because those images gained so ...
He is a member of the National Academy of Sciences, [1] and for the past thirty-five years, has been actively involved in tropical ecology and conservation issues. An authority on avian and mammalian ecology in Neotropical forests , Terborgh has published numerous articles and books on conservation themes.