Monthly Archives: June 2015

PLEA Network

22 June 2015, The Conversation, Climate: the elephant in the room for developing northern Australia: The recently released white paper on developing northern Australia ignores an elephant in the room: climate change. While the paper sees a bright future for the north (roads, rail, dams and food), without considering climate change we can’t be sure the north will even be liveable. The white paper also fails to take into account other environmental constraints such as water and soils….. The white paper has not referenced high-quality expert advice prepared by the Northern Australian Land and Water Task Force…. The white paper ignores reference to sophisticated climate change projections for northern Australia developed by our own CSIRO and Bureau of Meteorology. Climate projections for the north this century paint a dire future and bring into question the feasibility and affordability of many of the development policies, plans and projects outlined in the white paper. Read More here

 

PLEA Network

21 June 2015, The guardian, Catch them if you can: the pragmatic ways to cut carbon emissions: Within five years Britain could have three power stations that capture around 90% of their carbon before it reaches the atmosphere. And in the US, a synthetic resin could absorb CO 2 far more efficiently than trees. We examine the technologies involved in the battle against climate change. With an immense scientific consensus that manmade greenhouse gases cause climate change, there is pressure to reduce carbon emissions, but little sign that governments can reach a binding agreement to cut back sufficiently. The answer may be a new material that is a thousand times more efficient at capturing carbon dioxide than trees.

This substance, a synthetic resin, is a part of diverse attempts to make carbon capture and storage (CCS) practical. Mercedes Maroto-Valer, professor of sustainable energy engineering at Heriot-Watt University, defines CCS as “a portfolio of technologies that aim to separate carbon dioxide from other gases, then capture and store them in a permanent situation”. CCS is a pragmatic solution, recognising that we will continue to emit CO2, and so need to remove the gas from the atmosphere and store it away where it can do no harm. There are two primary strategies for capturing carbon dioxide. The natural mechanism is absorption by plants, which use CO2 to build their carbon-based structures, emitting oxygen as waste. Trees absorb a considerable amount of carbon and lock it away for much longer than smaller plants. However, trees take decades to reach a state when they absorb significant quantities of carbon. Read More here

PLEA Network

19 June 2015, Carbon Brief, The Atlantic ‘conveyor belt’ and climate: 10 years of the RAPID project: A global project that’s been instrumental in shaping scientists’ understanding of how the oceans affect our climate celebrated its tenth birthday recently. A new paper published in Science looks back at 10 years of the RAPID project, which has been keeping tabs on how heat moves around in the Atlantic Ocean since 2004. Over its short lifetime, the project has thrown up a few surprises. Parts of the Atlantic circulation seem to have slowed down, though whether that’s down to human activity remains to be seen. Carbon Brief talks to one of RAPID’s founding scientists, Prof Harry Bryden from the National Oceanography Centre in Southampton, about the project. Read More here

Global heat transport

Above about 1,000 metres in the North Atlantic, warm water flows northwards from the equator towards the poles, releasing heat as it goes. The water cools and sinks at high latitudes, returning southwards towards the equator at much deeper depths.

This is known as the Atlantic Meridional Overturning Circulation (AMOC) and forms part of aglobal ocean conveyor belt that transports heat all around the world.

                 Screenshot 2015-06-19 18.22.21

The Atlantic Meridional Overturning Circulation (AMOC). Warm water flows north in the upper ocean (red arrows) then sinks and returns south as deep cold water (blue arrows) Source: Srokosz & Bryden ( 2015) Supplementary material

PLEA Network
19 June 2015, Renew Economy, Queensland pushes through massive rises in fixed electricity charges. A victory for McMansions? Fixed charges to households surge, while small business may pay two-thirds of their bill on fixed charges, as government owned utilities move against solar and energy efficiency. The Queensland government managed to get some sympathetic coverage on the ABC and in the local mainstream media – and even some specialist websites who should know better – about the supposed “fall” in electricity bills in the upcoming year. But what they did not mention – presumably because it wasn’t in the Queensland Competition Authority press release – was a huge jump in fixed charges that will penalise households and small business, and reduce the incentive to install rooftop solar.

Fixed charges for households will jump more than 20 per cent to $1.07 a day, meaning that with GST, households will pay a minimum $428 a year on fixed charges, no matter how little electricity they consume. The consumption rate has been cut to 22c/kWh but this means nothing for households that consume around 7kWh a day – pensioners and single person households for instance, and others who pay attention to energy efficiency. Their annual bill will now be more than $1,050 – which equates to a rate of 42c/kWh, probably the highest in the world. And their ability to offset that with solar is greatly reduced because so much of the cost is unavoidable. But small businesses – butchers, restaurants, takeaway food installations, or anyone using refrigeration and cooking – face an even greater proportion of fixed charges under the new scheme. Read More here