If CO2 concentrations continued to increase at a rate of 2 ppm per year, what would be the approximate concentration by the year 2050? In Figure 17-3, label which forcing is represented by the bars...

If CO2 concentrations continued to increase at a rate of 2 ppm per year, what would be the approximate concentration by the year 2050?

In Figure 17-3, label which forcing is represented by the bars and label each of the three lines with the appropriate forcing. Explain why you chose each.