28 June 2017, The Conversation, The world’s tropical zone is expanding, and Australia should be worried. The Tropics are defined as the area of Earth where the Sun is directly overhead at least once a year — the zone between the Tropics of Cancer and Capricorn. However, tropical climates occur within a larger area about 30 degrees either side of the Equator. Earth’s dry subtropical zones lie adjacent to this broad region. It is here that we find the great warm deserts of the world.Earth’s bulging waistline Earth’s tropical atmosphere is growing in all directions, leading one commentator to cleverly call this Earth’s “bulging waistline”. Since 1979, the planet’s waistline been expanding poleward by 56km to 111km per decade in both hemispheres. Future climate projections suggest this expansion is likely to continue, driven largely by human activities – most notably emissions of greenhouse gases and black carbon, as well as warming in the lower atmosphere and the oceans. If the current rate continues, by 2100 the edge of the new dry subtropical zone would extend from roughly Sydney to Perth. As these dry subtropical zones shift, droughts will worsen and overall less rain will fall in most warm temperate regions. Poleward shifts in the average tracks of tropical and extratropical cyclones are already happening. This is likely to continue as the tropics expand further. As extratropical cyclones move, they shift rain away from temperate regions that historically rely upon winter rainfalls for their agriculture and water security. Researchers have observed that, as climate zones change, animals and plants migrate to keep up. But as biodiversity and ecosystem services are threatened, species that can’t adjust to rapidly changing conditions face extinction. In some biodiversity hotspots – such as the far southwest of Australia – there are no suitable land areas (only oceans) for ecosystems and species to move into to keep pace with warming and drying trends. We are already witnessing an expansion of pests and diseases into regions that were previously climatically unsuitable. This suggests that they will attempt to follow any future poleward shifts in climate zones. Read More here
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28 June 2017, Renew Economy, “Baseload”: An outdated term that should not be confused with “reliability”. The “coal versus no new coal” debate has come to define the battle lines over Australia’s energy future. It can basically be boiled down to one concept: the assumption that we have to rely on baseload power for the reliability and security of out electricity supply. A new report from the US highlights how the concept of “baseload” is really just an artefact of an old industry, and points out that baseload should not be confused with reliability. The two do not go hand in hand, and hanging on to the term is getting in the way of planning for the future. “Baseload power”, however, is a line encouraged by the fossil fuel industry, happy that “baseload” has become a marketing tool, in the same way that it has exploited the idea of “clean coal” and “energy poverty” to pursue their interests. The Brattle Group report was commissioned by the NRDC, a US-based NGO, just as the Trump administration prepares its own battle over the future of “baseload” in a rapidly changing energy market. It prompted this series of tweets. Read More here
26 June 2017, Washington Post, Sea level rise isn’t just happening, it’s getting faster. In at least the third such study published in the past year, scientists have confirmed seas are rising, and the rate of sea level rise is increasing as time passes — a sobering punchline for coastal communities that are only now beginning to prepare for a troubling future. What was a 2.2 millimeter per year rise in 1993 was a 3.3 millimeter rise in 2014, based on estimates of the mass changes of a number of key components of sea level rise, such as the melting of the Greenland and Antarctic ice sheets, the study in Nature Climate Change found. That’s the difference between 0.86 and 1.29 inches per decade — and the researchers suggest further sea level acceleration could be in store. The chief cause of the acceleration was the melting of the Greenland ice sheet, which went from contributing under 5 percent of all sea level rise in 1993 to contributing over 25 percent in 2014, the study found. The loss of ice in Antarctica and smaller glaciers over the same time period also contributed to quicker sea level rise. The increase in the rate of sea level rise “highlights the importance and urgency of mitigating climate change and formulating coastal adaptation plans to mitigate the impacts of ongoing sea level rise,” write Xianyao Chen of the Ocean University of China and Qingdao National Laboratory of Marine Science and Technology, and colleagues. Chen’s co-authors hailed from institutions in China, Australia and the United States. “We understand why the sea level is accelerating and we’re understanding what the components are contributing,” said Christopher Harig, one of the study’s authors and a researcher at the University of Arizona. Earlier this year, a different group of researchers found sea level rise was only about 1.1 millimeters per year before 1990, whereas in the period between 1993 through 2012 it was 3.1 millimeters per year. NASA, at present, puts the rate of sea level rise at 3.4 millimeters per year. But while the individual estimates differ, the broader picture is that researchers generally agree that the rate of sea level rise is increasing — and that this will have major consequences for coastal regions, which will have less time to adapt if sea level rise acceleration continues. Read More here
22 June 2017, Renew Economy, Australia’s new citizenship test: swear allegiance to Queen and Coal. The Coalition government’s new citizenship test appears to include talking points that might have been prepared by the coal industry in defending their role in climate change.Details of the extraordinarily complex reading material that new citizens are being asked to comprehend, in preparation for their citizenship tests, have been revealed in The Australian newspaper, which was concerned by the level of complexity in the language. What struck us at RenewEconomy from the examples used by The Australian was the nature of the content. It looked like marketing spiel from the coal industry, so we checked it out further. Take this, for example: “Clean coal is another avenue for improving fuel conversion efficiency. Investigations are under way into super-clean coal (35 per cent ash) and ultraclean coal (less than 1 per cent ash). Super-clean coal has the potential to enhance the combustion efficiency of conventional pulverised fuel power plants.” And on it goes. You can read more here. But having absorbed this, the hopeful new citizen is then given some practice multiple choice questions. Such as: Read More here and be astounded by the audacity!