From the prairies of Saskatchewan to a Manhattan skyscraper, Modern Marvels explores the 21st century's cutting-edge "green" technologies in action. Learn how tongue-twisting technologies such as carbon sequestration and bioremediation take on our most daunting environmental crises: global warming, deforestation, nuclear waste and resource scarcity. Then, experience the slimier side of environmental tech as blue-green algae are converted into automotive biofuel and decomposing garbage supplies into clean-burning natural gas. Find out how trees and other natural environments are now being used as engineering tools to control flooding and rejuvenate dying rivers.