Questions 28 through 30 use the following composite graph: Figure from Hansen et

Question

Questions 28 through 30 use the following composite graph: Figure from Hansen et al,”Target Atmospheric CO2” Open Atmospheric Science Journal 2 (2008):217-31 Use the Hansen graph to answer the following questions. In this graph, year “0” is the Start of the Industrial Revolution (the late 1700’s). Use the straight line function to aid you in determining the correct answer (Choose” insert” at the top of this MS Word page, then “shapes” and click on the straight line function) 28. During the approximately 425,000 years prior to the start of the Industrial Revolution, what was the highest concentration of CO2 (in parts per million, ppm) that occurred during that time period? (1 point)

Explanation / Answer

During the 425,000 years prior to the industrial revolution, the CO2 concentration has changed many times in the past. CO2 fluctuation was highest in the Cenozoic.The CO2 level ranges changes from 180 ppm in the glacial times to 1500 ppm in the early Cenozoic. After the industrial revolution the CO2 level has increased drastically. At present the average level of CO2 in the atmosphere is 385 ppm. The increase of CO2 in the atmosphere led to the global warming. The CO2 level is increasing at the rate of 2 ppm each year due to mainly burning of fossil fuels. We are already at the danger level of CO2.

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