As concerns over the environmental cost of flying continue to mount, green propulsion systems can offer an ethical alternative.http://rss.cnn.com/~r/rss/edition_travel/~3/UEXm_pVFYK4/index.html
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As concerns over the environmental cost of flying continue to mount, green propulsion systems can offer an ethical alternative.http://rss.cnn.com/~r/rss/edition_travel/~3/UEXm_pVFYK4/index.html