} } //--> UPDATE HOTLINE QUIZ HOME Energy & the Environment: The Greenhouse Effect See also... Rainforest Destruction Acid Rain In the past 100 years the concentration of carbon dioxide in the atmosphere has increased by 25&#37.
(the concentration of carbon dioxide; has increased; by 25&#37; T:In the past 100 years; L:in the atmosphere)
the concentration of carbon dioxide
has increased
by 25&#37 T:In the past 100 years L:in the atmosphere