More than that, the details of what has happened to the climate of southwestern Australia are simply not taught in schools in the Enriched or Tropical World, despite the fact that they have infinitely more relevance, utility and potential economic loss (farming and urban water supply) than the fate of ice caps lying in regions without cities, possessing nothing whatsoever in significant natural resources like iron, aluminum and titanium ores, and with no frost-free season to permit agriculture at all.
Despite political (and scientific) dithering between 1980 and 2005 over what has caused a reduction of about five-sixths in runoff to Perth’s dams, the extremely insular scientific community has not been able to persuade people, even locally, that radical and compromise-free changes in planning in Australia are essential to reverse the trend.
In this context, it is revealing that Thomas Delworth and Fanrong Zeng of Nature has once and for all confirmed that the decline in rainfall over southwestern Australia is completely anthropogenic, and that natural cycles could never produce the observed rainfall declines. Delworth and Zeng demonstrate with good models that rainfalls are likely by 2090 to fall to between a quarter and three-tenths the virgin mean if Australian carbon emissions are not cut back. Such a value would leave Perth with a mean annual rainfall of around 300 millimetres – enough with hotter temperatures to qualify as a fully arid BWh climate under the Köppen system.
Both researchers are revealingly from Princeton Unversity in New Jersey rather than Australia’s depoliticised science bodies who should be urging the government to transfer 100 percent of private- and public-sector transport monies to a high-speed rail network and demolition of all (inherently unsustainable) freeways, and to ensure that road projects can be constitutionally challenged and wiped out: fuel inefficiency of single-occupant cars stands too low for any road to be viewed sustainable.
Whilst the idea of making road building illegal is radical, Australian ecology is so sensitive to climate change and land degradation compared to the exceptionally young land surfaces of Eurasia and most of the Americas, which have over mere blips in geological time been shaped by radical changes from ice-covered to uniquely hospitable for high-density agricultural populations. Incomparably more rigid laws are needed to achieve any kind of sustainability in Australia, the thirteenth highest emitter in the world, where ecosystems have been adapted for tens of millions of years to similar (if wetter) climatic conditions as the continent’s pace of drift matched global cooling for steady-state temperatures and soils remained likewise the same. In contrast, Eurasia’s and the Americas’ soils have been completely transformed in merely two to four million years – from being similar to Australia’s into soils averaging five times as much available phosphorus, with similar increases in critical nutrients sulfur, copper and zinc.
|Delworth and Zeng have confirmed that global warming is likely to ensure the Avon becomes a dry stream even during the former rainy season of southwestern Australia, as the rain-bearing fronts gradually disappear from the region.|