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References

Data for T.N.O.E.P. software and online feedback in gauge form are obtained from the following sources:

• CO₂: Season corrected concentration in ppm at Mauna Loa, Hawaii (data from previous month; preliminary).  
  • General: Dr. Pieter Tans, NOAA, ESRL
    (http://www.esrl.noaa.gov/gmd/ccgg/trends/).  Please see site for a fuller description of how and where data is collected and calculated as well as comparison to global values.
  • Data: ftp://ftp.cmdl.noaa.gov/ccg/co2/trends/co2_mm_mlo.txt
  • See also: http://en.wikipedia.org/wiki/Co2
• ^oC: Temperature Anomaly 
  
  • General: http://data.giss.nasa.gov/gistemp/
  • Data: http://data.giss.nasa.gov/gistemp/tabledata/GLB.Ts+dSST.txt
    (Combined Land-Surface Air and Sea-Surface Water Temperature Anomaly.  Data is for previous month)
  • See also: http://en.wikipedia.org/wiki/Global_average_temperature
  • Temperature anomaly is used because absolute temperature varies "markedly" over short distances while (monthly or annual) anomalies are representative of a much larger region (see here for a fuller discussion).
• ^oC: Average Temperature 
• Worldometers - real time world statistics.  16 Apr 2011 Worldometers.info <http://www.worldometers.info>
• Oil: Estimated years remaining
• Worldometers - real time world statistics.  16 Apr 2011 Worldometers.info <http://www.worldometers.info>
• http://en.wikipedia.org/wiki/Oil_reserves
• http://en.wikipedia.org/wiki/Reserves-to-production_ratio
• See also:
  https://www.cia.gov/library/publications/the-world-factbook/rankorder/2178rank.html
• %Renewables: http://en.wikipedia.org/wiki/World_energy_consumption (See: http://en.wikipedia.org/wiki/File:World_energy_usage_width_chart.svg
  • Worldometers - real time world statistics.  16 Apr 2011 Worldometers.info <http://www.worldometers.info> (Energy from renewable sources (MWh) / Energy used worldwide today (MWh)
    
    
• World Population Estimates: Worldometers - real time world statistics. 16 Apr 2011 Worldometers.info <http://www.worldometers.info>
• see also: http://en.wikipedia.org/wiki/World_population_estimates
• World Ecological Footprint value as displayed in icon in system tray: Global Footprint Network, 2010 Edition.  www.footprintnetwork.org.  See also the Living Planet Report 2010.