PNNL

Abstract

The problem of stabilizing the concentration of CO2 is fundamentally different than the problem of stabilizing the concentration of a conventional pollutant or even other non-CO2 greenhouse gases. A fraction of any net anthropogenic emission is permanently committed to the atmosphere and in the very long term net anthropogenic emissions must cease if atmospheric CO2 concentrations are to be stabilized. Many of the technologies that could play a large future role in limiting cumulative carbon emissions are minor elements in the present energy system. A portfolio of technologies will be needed to address the variety of technology needs across the world's regions and over time.