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   |  | References
Natural Draft Air Flow and Velocity Calculator.http://www.engineeringtoolbox.com/natural-draught-ventilation-d_122.html
 
 
Air - Altitude, Density and Specific Volume http://www.engineeringtoolbox.com/air-altitude-density-volume-d_195.html
 
 
Kiehl, J. T. and Trenberth, K. E. (1997). "Earth's 
  Annual Global Mean Energy Budget". Bulletin of the American Meteorological 
  Association 78: 197-208. 
 
James Hansen, Larissa Nazarenko, Reto Ruedy, Makiko 
  Sato, Josh Willis, Anthony Del Genio, Dorothy Koch, Andrew Lacis, Ken Lo, 
  Surabi Menon, Tica Novakov, Judith Perlwitz, Gary Russell, Gavin A. Schmidt, 
  Nicholas Tausnev (2005). "Earth's Energy Imbalance: Confirmation and 
  Implications". Science 308 (5727): 1431-1435. 
 
Wikipedia, Image:Greenhouse Effect.svg  http://en.wikipedia.org/wiki/Image:Greenhouse_Effect.svg#filelinks
 
 
Mile-high tower: Saudi prince promises ?5bn desert spire TWICE as tall as nearest rival being built.http://www.dailymail.co.uk/pages/live/articles/news/worldnews.html?in_article_id=550548&in_page_id=1811
 
 
How Can I Calculate the Amount of Power Available at a Given Wind Speed?http://www.awea.org/faq/windpower.html
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