31 Jul 2012:
Low Levels of Caffeine Found
In Waters of U.S. Pacific Northwest
In a new study, scientists document low levels of caffeine pollution in the waters off the Oregon coast, fresh evidence that contaminants from human waste are entering marine ecosystems with unknown risks to wildlife and human health. In a series of tests conducted at 14 coastal locations, researchers found that
caffeine levels were higher — about 45 nanograms per liter — in remote waters, while levels were below reporting limits (about 9 nanograms per liter) near “potentially polluted” areas such as sewage treatment plants, the mouths of rivers, and larger communities, National Geographic reports
. According to the findings, published in the journal Marine Pollution Bulletin
, the higher levels are likely occurring near sites with on-site waste disposal systems that are subject to less monitoring than larger wastewater treatment plants. While the environmental effects of such low-level contamination are not known, experts say they are a reminder of the range of pollutants — from pharmaceuticals to artificial sweeteners — entering natural ecosystems through human waste. “What does this mean?” asked Dana Kolpin, a U.S. Geological Survey hydrologist not affiliated with the study. “Aquatic organisms are getting hit with a soup of low-level contaminants.”
Yale Environment 360 is
a publication of the
Yale School of Forestry
& Environmental Studies
Yale Environment 360
articles are now available in Spanish and Portuguese on Universia
, the online educational network. Visit the site.
Business & Innovation
Policy & Politics
Pollution & Health
Science & Technology
Antarctica and the Arctic
Central & South America
The 2015 Yale e360 Video Contest winner documents a Northeastern town's bitter battle over a wind farm. Watch the video.
is now available for mobile devices at e360.yale.edu/mobile
A 2015 Yale e360 Video Contest winner captures stunning images of wild salmon runs in Alaska. Watch the video.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
A three-part series Tainted Harvest
looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup. Read the series.
video goes onto the front lines with Colorado firefighters confronting deadly blazes fueled by a hotter, drier climate. Watch the video.