Greenhouse Gases Although greenhouse gases are essential to maintaining the temperature of the earth, an excess of greenhouse gases can raise the temperature to dan-gerous levels. One of the most threatening greenhouse gases is carbon dioxide (CO2 ). The Mauna Loa atmo-spheric CO2 measurements constitute the longest contin-uous record of atmospheric CO2 concentrations available in the world. The following table shows the concentration of CO2 (in parts per million) at Mauna Loa, Hawaii for three years. (Source: noaa.gov.)
Year | CO2 (ppm) |
1968 | 323 |
1990 | 354 |
2011 | 392 |
(a) Use the method of least squares to obtain the straight line that best fits these data. (Let x = 0 correspond to 1968.)
(b) Estimate the concentration of CO2 in the year 2000. How does this compare with the actual reading of 370?
(c) If the trend continues, in what year will the concen-tration of CO2 reach 401 ppm?
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