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Still
think warnings about climate change are overblown?
Below is a chart whose implications I think everyone should try to grasp. It shows the relationships between carbon dioxide (CO2), methane (CH4) and temperature for the last 430,000 years from Antarctic ice cores and from data from the last century. Temperature doesn't respond in lock-step with the changes in gas concentration. There's a lag because of the massive size and volume of the oceans. But temperatures have risen about 0.7șC since pre-industrial times and about another 0.6șC is coming down the pipe because of gases we've already emitted. The consequences of average temperatures rising above 2șC are horrendous. As the chart below suggests, we have a serious problem on our hands. Note that temperature is measured in terms of deviations from the average from 1880-1899, which is set to zero. Carbon dioxide is measured in parts per million (ppm) and methane is measured in parts per billion (ppb). Kyr = “thousands of years”. Source: Hansen, J.E., (2005) "A Slippery Slope: How Much Global Warming Constitutes "Dangerous Anthropogenic Interference"?" Climatic Change, Vol. 68, No. 3, February, pp. 269-279, p. 271.
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Research
Fellow
& Development Research Unit Monash University Wellington Rd. Clayton, VIC, 3800 AUSTRALIA Tel: +61 (0)3 9905 5843 Email: Brett.Parris [at] buseco.monash.edu.au |
![]() Economics, Climate & Natural Resources Team World Vision Australia 1 Vision Drive Burwood East, VIC, 3151 AUSTRALIA Tel: +61 (0)3 9287 2383 Email: Brett.Parris [at] worldvision.com.au |
