THE Intergovernmental Panel on Climate Change model of dangerous, human-caused climate change has failed. Independent science relevant to supposed human-caused global warming is clear, and can be summarised in four briefpoints.
First, global temperature warmed slightly in the late 20th century and has been cooling since 2002. Neither the warming nor the cooling were of unusual rate or magnitude.
Second, humans have an effect on local climate but, despite the expenditure of more than $US50 billion ($70 billion) looking for it since 1990, no globally summed human effect has ever been measured. Therefore, any human signal must lie buried in the variability of the natural climate system.
Third, we live on a dynamic planet; change occurs in Earth’s geosphere, biosphere, atmosphere and oceans all the time and all over the world. No substantive evidence exists that modern rates of global environmental change (ice volume; sea level) lie outside historic natural bounds.
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Jennifer Marohasy BSc PhD has worked in industry and government. She is currently researching a novel technique for long-range weather forecasting funded by the B. Macfie Family Foundation.