Is Carbon Sequestration Feasible at the Scale of the by wxw48807

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									 Is Carbon Sequestration
Feasible at the Scale of the
  Global Carbon Cycle?
              Eric Sundquist
    U.S. Geological Survey, Woods Hole


          Yale University Forum
    Carbon Sequestration: Is It Feasible?
              April 7, 2006
        Time scales of carbon cycle change
•   Changes in
    atmospheric
    CO2 reflect
    natural
    carbon-cycle
    interactions
    that occur
    over a wide
    range of time
    scales.

•   Injection of
    anthropogenic
    CO2 into the
    atmosphere
    sets off
    natural
    responses that
    span the full
    range of time
    scales
        The Calculus of CO2 Projections
•   Short-term (years)
    and medium-term
    (decades) peak
    concentrations
    depend on rate of
    net emissions

•   Long-term
    (centuries) and
    very long-term
    (millennia)
    “stabilization”
    asymptote
    depends on
    cumulative net
    emissions
                         Source: IPCC SRCCS, 2005, adapted from Kheshgi, 2003
Hedging by Wedging




         Source: Dooley et al., 2004, in IPCC SRCCS, 2005
                    Questions
• Can carbon sequestration be implemented at rates
  sufficient to significantly reduce the projected CO2
  peak in the coming decades to centuries?

• Can carbon sequestration be implemented in
  cumulative quantities sufficient to significantly
  reduce the projected CO2 “stabilization” asymptote
  in the coming centuries to millennia?

• How can we better engage the public in
  consideration of the feasibility of carbon
  sequestration and reduction of CO2 emissions by
  energy conservation and use non-fossil energy
  sources?

								
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