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  2. Air - Altitude, Density and Specific Volume

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  4. 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.

  5. Wikipedia, Image:Greenhouse Effect.svg

  6. Mile-high tower: Saudi prince promises ?5bn desert spire TWICE as tall as nearest rival being built.

  7. How Can I Calculate the Amount of Power Available at a Given Wind Speed?