Flow patterns

• Flow patterns indicate clement early atmosphere with CO2 pressures of 1-15 bar

  (Krasapolsky, Owen & Maillard 2000)
  

• Lack of plate tectonics prevents recycling of CO2

• 1-2 bar CO2 injection can sustain surface temperatures of 250 K for 108 yr..

  (Stern & Levison 1999)
  

1 bar CO2 can be delivered by ~7 x 106 comets with a 1 km radius, this influx is comparable to the Late Heavy Bombardment flux of comets on mars

(Levison 1999)

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