Human Influence

Penguins Changed Diet Due to Whaling, Study Suggests

Publication: National Geographic News   Date: July 20, 2007   View Article

Extensive whale and seal hunting in Antarctica over the past 200 years appears to have triggered a shift in the diet of Adélie penguins, a new study suggests.

The seabirds abandoned fish in favor of krill, shrimp-like crustaceans that are a major component in the diets of fur seals and baleen whales.

Global Warming “Very Likely” Caused by Humans, World Climate Experts Say

Publication: National Geographic News   Date: February 2, 2007   View Article

Global warming is here, it’s human-caused, and it will continue for centuries even if greenhouse-gas emissions are stabilized, an international panel of climate experts said in a report issued today.

The Intergovernmental Panel on Climate Change (IPCC) used its strongest language yet to link human activity to Earth’s warming temperatures, rising seas, more intense storms, and a host of other environmental maladies.

First Evidence That Wildlife Corridors Boost Biodiversity, Study Says

Publication: National Geographic News   Date: September 1, 2006   View Article

Conservation corridors are a boon for plant diversity, according to a new study that researchers say proves a widely practiced but still controversial theory.

The corridors are narrow strips of land that connect isolated patches of wild habitat, such as nature reserves, often trapped in seas of human developments such as farms and subdivisions.

Earth Hottest It’s Been in 400 Years or More, Report Says

Publication: National Geographic News   Date: June 23, 2006   View Article

The last two decades of the 20th century were the hottest in 400 years and quite likely the warmest for several millennia, a leading U.S. scientific body concludes in a new report.

The National Academies’ National Research Council report also said “human activities are responsible for much of the recent warming.”

Oceans Suffer Attention Deficit in Journals, Experts Say

Publication: National Geographic News   Date: August 19, 2003   View Article

The world’s oceans are in crisis. Pollution, overfishing, invasive species, habitat destruction, and a myriad of other human impacts are impeding the oceans’ ability to feed us, control the weather, and maintain Earth’s chemical balance.

Despite the human race’s dependence on the oceans for survival, however, attention to marine conservation science lags far behind that paid to conservation of firm ground, according to Phillip Levin, a marine scientist with the National Oceanic and Atmospheric Administration Northwest Fisheries Science Center in Seattle, Washington.

© 2008-2010 Collected Writings By John Roach