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Most of the technology effort is going toward alternative energy sources and energy efficiency but there are technologies proposed which would allow us to clean up existing fossil fuel energy usage.

Solution Chart at Ngee Ann Polytechnic in Singapore.

Source: Playing God at GeoCrisis.com

Energy Efficiency
      Hybrid and Electric Cars
      Improved Airplane design
     Green Homes and Buildings
Technological Advances
    Carbon Emission Reduction
       Artificial - Capture and Sequestration
       Natural - Reforestation
    Reflecting sunlight
Carbon Capture and Sequestration (CCS)- Capturing CO2 and putting it somewhere where it won't be released into the atmosphere.

Carbon Capture and Sequestration Technologies @ MIT
Carbon capture and storage - Wikipedia

Other far out proposals:
Reflecting sunlight:
  Sun Shields in space:
  Aersols in space:  
  Cloud Seeding:

 Geoengineering The Planet
 giant sun-shield  AstroBio.net
 Shading the Earth = National Geographic Magazine
YouTube - Discovery Channel Project Earth: Forest Torpido

How to Cool the Planet: Geoengineering and the Audacious Quest to Fix Earth's Climate, by Jeff Goodell, 2010

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last updated 28 Mar 2010