29 Nov 2011:
Carbon Sinks in Estuaries
Have Been Degraded by Industrial Activity
The ability of the world’s estuaries, salt marshes, and mangrove swamps to sequester carbon has been seriously degraded by industrial activity
, according to a study by Australian researchers. Scientists at the University of Technology, Sydney, examined layers of estuary sediment in Sydney’s Botany Bay for the past 6,000 years. They found that sea grass abundance has declined sharply, while quantities of micro-algae have soared. Increasing nitrogen deposition and pollution are the main culprits in destroying seagrass beds, which have the capacity to store as much as 100 times more carbon than micro-algae. The researchers dated the sediments using radiocarbon dating and determined the plant makeup of the Botany Bay estuary by examining isotopic ratios of seagrass versus micro-algae. Reporting in the journal Global Change Biology
, lead researcher Peter Macreadie said the results show the importance of preserving and restoring so-called “blue carbon habitats” in the world’s wetlands and estuaries. The partial loss of these carbon sinks has “severely hampered the ability of nature to reset the planet’s thermostat.”
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
A look at how acidifying oceans could threaten the Dungeness crab, one of the most valuable fisheries on the U.S. West Coast. Watch the video.
is now available for mobile devices at e360.yale.edu/mobile
An aerial view of why Europe’s per capita carbon emissions are less than 50 percent of those in the U.S. View the photos.
An indigenous tribe’s deadly fight to save its ancestral land in the Amazon rainforest from logging. Learn more.
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.
Residents of the Chocó Rainforest in Ecuador are choosing to plant cacao over logging in an effort to slow deforestation.
Watch the video.
Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.