How do the levels of CO measured at Mauna Loa compare with the levels from the Vostok ice 2 core? How does the rate of increase in the Mauna Loa data compare to the highest rates of increase recorded in the Vostok ice core? Why are scientists concerned about this? The following graph shows records of temperature and carbon dioxide (CO2) from the Vostok ice core in Antarctica, as well as the annual mean data from Mauna Loa..