| http://www.w3.org/ns/prov#value | - The models had generally indicated that tropical ecosystems were a net source of 1.8 billion tons of carbon, largely because trees and other plants release carbon into the atmosphere as a result of widespread logging, burning and other forms of clearing land.The new research indicates, instead, that tropical ecosystems are the net source of only about 100 million tons, even though tropical defores
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