In this article, Daniel Nepstad and others, who published these findings in the prestigious journal Nature (April 8, 1999), discuss the issue of "Cryptic Deforestation," in which "as much as half of forest damage in Amazonia may go undetected by satellite mapping." Consequently, more carbon dioxide may be being released into the atmosphere from the rainforest than previously calculated. The article is available in .pdf format and may be browsed or downloaded at the site.