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.