Feed aggregator

Experts says the 2017 bushfire season will start early and be more intense than usual.

Independent Senator Jacqui Lambie says Snowy Hydro 2.0 and other projects should be fast-tracked, rather than relying on coal.

Scientists from Florida International University have teamed up with Nasa to create the world's deepest coral farm in an effort to tackle the decline of coral reefs.

Energy rule-maker says it supports change to 5 minute settlement period, but wants it introduced gradually and not before July, 2021.

Coalition wants AGL to keep 46-year old Liddell coal generator open another five years, despite AEMO saying there is no threat to security standards and best way to minimise is to have more renewables.

AEMO says the biggest threat to Australia's electricity supply is hotter temperatures, failure of large fossil fuel plants, and delays in investment in new wind and solar. Smart solutions such as demand management and storage will mean no need for new coal generators.

Wind energy has supplied a constant output of 1200MW over last three days in South Australia - just like "baseload"

Abriachan, Highlands In places, the canopy of thistle, ling, scabious and soft rush was sunk in a near-weightless empire of silk

Aside from the slurry of S-sounds tipped out by a roadside burn, there was nothing at this spot but the early morning hush of the moor. Yet the silence seemed only to emphasise all the internal noise generated in me by an assault from midges. They started as a loose-meshed veil about my hands and face but soon thickened into a maddening private halo.

They particularly wanted my wrists – I have 23 bites there as I type – and I could invert my binoculars to watch the 2mm beasts, with their pin-thin heads and barred bodies, at their work. How can something so easily turned to a smudge on a notebook page puncture human skin?

Continue reading...

Government experts say adverse health effects are unlikely, but campaigners argue the primary school scheme should switch to organic as a precaution

The free fruit and vegetables provided by the government to millions of young schoolchildren usually contain the residues of multiple pesticides, according to official tests collated in a new report.

In the last decade, residues of of 123 pesticides were found, while apples and bananas given out recently in schools contained more residues than those sold in supermarkets.

Continue reading...

More than four times as many people blame Malcolm Turnbull for sky-high power prices than renewable energy companies. That power campaign went well didn't it!

Australian tech investor Mike Cannon-Brookes has tipped close to $4m into home energy loan start-up Brighte.

The Mt. Takeha volcano in west Antartica rises more than 2,000 metres above the surrounding ice sheet. Wikimedia commons

Around 25,000 years ago, during a period known as the Last Glacial Maximum, ice covered much of the world’s landmasses. Comparatively weaker sunlight, large continental ice sheets, and very low amounts of carbon dioxide in the air created the right conditions for an ice age. During the next 15,000 years the global climate shifted from glacial to warm, interglacial conditions as sunlight strengthened.

But the Southern Hemisphere’s climate changed abruptly roughly 18,000 years ago. Rather than the gradual decline you might expect as Earth’s orbit slowly drew nearer to the Sun, something triggered a widespread and simultaneous abrupt change in climate across many continents.

In research published today in Proceedings of the National Academy of Sciences, an international group of researchers and I discovered that a unique, 192-year series of massive volcanic eruptions coincided exactly with the onset of this period of rapid, widespread Southern Hemisphere climate change.

Read more: Volcanoes under the ice: melting Antarctic ice could fight climate change

These abrupt climate changes included the pronounced retreat of glaciers in Patagonia and New Zealand and reduced aridity in southern Australia. Lakes rapidly expanded in the Bolivian Andes, and summertime rain in subtropical Brazil increased. Atmospheric dust, recorded in ocean sediment and Antarctic ice cores, was sharply reduced.

Many of these changes have been attributed to a sudden poleward shift in westerly winds encircling Antarctica. The shifting winds changed ocean circulation and ventilation in the deep ocean, affecting glaciers across the southern hemisphere.

What our research explains for the first time is why the winds suddenly changed, and why there was a simultaneous climate transformation across the whole Southern Hemisphere.

Clues within the ice

Antarctica has always been home to globally significant volcanoes. However, 17,700 years ago a unique event began: nearly continuous volcanic eruptions over 192 years that spewed huge amounts of chemicals known as halogens into the Antarctic atmosphere.

A researcher loads 18,000-year-old Antarctic ice for continuous analysis. PNAS, CC BY

These halogens – including powerful ozone destroyers bromine, chloride and iodine – created a hole in the ozone layer, which was in many ways similar to the modern hole triggered by humans’ use of halogen-containing compounds called CFCs. This led to large-scale changes in atmospheric circulation and initiated the shift away from a glacial climate state.

These findings are based on detailed chemical measurements of a broad range of elements and chemical traces in Antarctic ice cores. Most of these came from the West Antarctic Ice Sheet Divide (WAIS), a 3,405 metre deep drilling site that provides highly precise climate records over the past 68,000 years.

Read more: Explainer: what are ice cores?

Our research included the broadest suite of chemical and elemental analysis ever attempted on a deep ice core, and the most precise breakdown of time. This record of the eruptions was precisely duplicated in replicate samples from the same ice core, and in ice cores taken from near Byrd Station in West Antarctica, and Taylor Glacier in Antartica’s Dry Valleys.

The ice core records showed a very unusual, 192-year chemical anomaly from 17,748 to 17,556 years before present.

We augmented the high resolution ice core analyses with a host of lower resolution measurements of interplanetary dust, rock fragments ejected during volcanic eruptions, and sulphur isotopes. Together, they clearly showed the chemical anomaly was the result of a series of massive volcanic eruptions from Mt Takahe, about 350km north of our main drill site.

Other characteristics of the chemical record – including anomalies in sulfur isotopes and near complete bromine depletion in the ice during the event – were consistent with increased ultraviolet radiation at Earth’s surface. It suggests that halogens (chlorine, bromine, and iodine) and other material from the Mt Takahe eruptions reached the Antarctic stratosphere where they destroyed ozone.

The massive, halogen-rich eruptions of Mt. Takahe coincided with the onset of abrupt and widespread climate change in the southern hemisphere, and increasing greenhouse gas concentrations during the end of the last ice age. Author provided

These eruptions and their chemical signature are unique in the 68,000-year WAIS Divide record. Fallout containing elevated levels of hydrofluoric and hydrochloric acid, as well as toxic heavy metals, extended at least 2,800km from Mt Takahe and may have reached southern South America.

Correlation vs causation

The Southern Hemisphere’s glaciers took 10,000 years to fully retreat. But these unique volcanic eruptions occurred just before (or possibly during) the most significant period of rapid climate change in the Southern Hemisphere, and global greenhouse gas concentrations increased during this time.

The fundamental question is: “did these two events occur at the same time by coincidence or were they causally linked?” The probability that these two events coincided simply by chance is negligible. Based on the evidence we found in Antartica’s ice cores, the depletion of the ozone layer may be the crucial linking factor.

We can bolster this link by comparing the climate change of 17,700 years ago to observable climate change today attributed to the modern Antarctic ozone hole. We can also look to climate models that simulate the behaviour of an ozone hole under glacial conditions. Overall, the widespread climate change observed in many paleoclimate records can best be explained by this singular and dramatic event in western Antarctica.

Joe McConnell receives funding from U.S. National Science Foundation.

Hydro and gas generation get higher half hourly prices than coal in Australia's energy market. Wind & solar PV take a discount.

Australia faces energy crisis caused by failure of Labor and Coalition to face reality of both climate change and the technological transformation of the energy sector.

Greenland may have gained a small amount of ice over the 2016-17 year - a one-year blip in long-term trend of year-on-year declines.

Renewable energy is increasingly profitable without subsidies, and coal has become uninvestable without government intervention – this used to be the opposite.

Republican Congressman named to head NASA had demanded Obama apologize for funding climate change research.

Eight companies short-listed to tender for job to develop, operate 5MW solar farm on former landfill site at Newcastle.

NSW community-owned retailer to buy excess rooftop solar from customers, as well as from local community solar farms and gardens, to sell on to other customers who can’t generate solar themselves.

Scientists connect the solar storms behind the Aurora Borealis to the deaths of 29 whales in the North Sea.