Procedure: Study the graph below (Figure 9.1). Answer the guide questions.
390 380 370 360 350 340 330 320 310 300 290 280
58.1 57.9 57.7 57.5 57.3 57.1 56.9 56.7 56.5
GLOBAL TEMPERATURES CO2 (Ice cores) CO2 (Mauna Loa)
Figure 9.1: Global temperature and carbon dioxide.