Projected CO2 Concentration
						q Projecting the future CO2 concentration is more difficult than projecting the emission levels. q The future concentration of CO2 in the atmosphere also depends on how the climate system redistribute the excessive CO2 among its carbon reservoirs (such as ocean and biosphere). q CO2 level in the atmosphere peaks centuries after CO2 emission reaches its peak. q This is related to the fact that it take time for ocean to remove the excessive CO2 from the atmosphere.