Ramesh Murthy gazes up at a stand of cottonwood trees growing in the high Sonoran Desert 35 miles northeast of Tucson, Arizona. Planted as 6-inch stumps, the 20 to 25-foot-tall trees offer shade from the warm midday sun. Rather than growing along some desert stream, however, these cottonwoods stand in neat rows within a futuristic-looking, glass-and-steel enclosed structure at the Biosphere 2 Center in the Santa Catalina Hills near Oracle, Arizona. They were planted not to restore a natural habitat or to save an endangered species, but for a series of experiments to test how ecosystems might respond to rising carbon dioxide levels and other climate changes associated with global warming.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 52 • No. 3