FIGURE 2.7 Projections of global CO2 emissions (from fossil and industrial sources) and CO2-equivalent concentrations (CO2-eq) in the absence of efforts to address climate change, from the EMF22 study. The left panel shows global (fossil and industrial) CO2 emissions from across models. The right panel shows the CO2-eq concentrations, including all the Kyoto Protocol gases, for the same corresponding scenarios. Model projections vary, but all show increasing emissions and concentrations over time. See Box 2.1 for definition of CO2-eq concentrations. SOURCE: L. Clarke, PNNL.