Scientists test trees' ability to combat more carbon dioxide. From: News & Observer (Raleigh, NC) | Date: July 15, 2007 | COPYRIGHT 2007 The News & Observer. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group.Copyright information

Byline: Wade Rawlins

Jul. 15--In a corner of Duke Forest, rings of white towers rise above the green canopy of the pine forest like futuristic monuments.

Day and night, thousands of pounds of odorless carbon-dioxide gas spews from the towers in computer-controlled streams. The goal is to simulate a forest with greenhouse gas levels that approximate the levels predicted by 2050.

For 13 years, researchers have been using the Blackwood section of Duke...

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