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Experts say human impact on Earth so profound that Holocene must give way to epoch defined by nuclear tests, plastic pollution and domesticated chicken

Humanity’s impact on the Earth is now so profound that a new geological epoch – the Anthropocene – needs to be declared, according to an official expert group who presented the recommendation to the International Geological Congress in Cape Town on Monday.

The new epoch should begin about 1950, the experts said, and was likely to be defined by the radioactive elements dispersed across the planet by nuclear bomb tests, although an array of other signals, including plastic pollution, soot from power stations, concrete, and even the bones left by the global proliferation of the domestic chicken were now under consideration.

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Nova Innovation deploys first fully operational array of tidal power turbines in the Bluemull Sound

A power company in Shetland has claimed a breakthrough in the race to develop viable offshore tidal stations after successfully feeding electricity to local homes.

Nova Innovation said it had deployed the world’s first fully operational array of tidal power turbines in the Bluemull Sound between the islands of Unst and Yell in the north of Shetland, where the North Sea meets the Atlantic.

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Researchers at Stanford University have designed a unique bird tunnel to observe how tiny birds fly.

The California state government passed AJR 43, urging the national government to pass a revenue-neutral carbon tax

Last week, the California state senate passed Assembly Joint Resolution 43, urging the federal government to pass a revenue-neutral carbon tax:

WHEREAS, A national carbon tax would make the United States a leader in mitigating climate change and the advancing clean energy technologies of the 21st Century, and would incentivize other countries to enact similar carbon taxes, thereby reducing global carbon dioxide emissions without the need for complex international agreements; now, therefore, be it Resolved by the Assembly and the Senate of the State of California, jointly, That the Legislature hereby urges the United States Congress to enact, without delay, a tax on carbon-based fossil fuels; and be it further Resolved ... That all tax revenue should be returned to middle- and low-income Americans to protect them from the impact of rising prices due to the tax

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Conservationists fear this year’s cool spring and slow start to summer have taken their toll on one of UK’s best-loved butterflies

Conservationists are warning of the decline of one of the UK’s best-loved butterflies.

Numbers of the small tortoiseshell – which is one of the most recognisable and widespread in the country – appear to have plummeted this summer.

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Turbines installed off the coast of Shetland could herald a "new era" in tidal energy, according to the company running the project.

Paula Kahumbu: Elephant diplomacy is helping to get Japan on board in efforts towards a global ban on ivory trade

The global coalition for a total ban on the trade in ivory is taking shape. In Africa calls for the ban are led by the 29 nation African Elephant Coalition (AEC). In the consumer countries, both the US President Obama and China’s President Xi have made commitments to close the domestic markets which will have a huge impact on demand.

To be sure, progress towards building the coalition is uneven. Key African nations such as Zimbabwe and Namibia are opposed to the ban, and have even petitioned CITES for a relaxation of current restrictions. In Europe, while the French Environment Minister Ségolène Royal has signed a decree banning the trade, in the UK the Department for Environment, Food and Rural Affairs says it is still “working” on its pledge to implement a total ban on ivory sales.

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Former environment minister entitled to find any assessment of resulting carbon pollution on the Great Barrier Reef was ‘speculative’, court says

The federal court has upheld the commonwealth approval of Adani’s Queensland mine, ruling that former environment minister Greg Hunt was entitled to find any assessment of resulting carbon pollution on the Great Barrier Reef was “speculative”.

The court on Monday dismissed a challenge by the Australian Conservation Foundation (ACF), which claimed Hunt failed to consider the impacts of the mine’s 4.6bn tonnes of emissions on the world heritage values of the reef.

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Can mining in the 21st century deliver the goods and be more socially and environmentally acceptable?

In calling for an end to fossil fuel subsidies, critics of Australia’s fuel tax credits system have highlighted its cost to Australian taxpayers and the budget bottom line.

The Greens have said that ending fossil fuel subsidies to big mining companies would save Australian taxpayers A$21 billion over the forward estimates (the next four years). On the ABC’s Q&A program, Greens deputy leader Larissa Waters said her party advocated:

getting rid of the A$24 billion over the forward estimates – that’s four years – in free money that goes to the fossil fuel sector in things like cheap diesel and accelerated depreciation.

These numbers are drawn from policy costings produced by the Parliamentary Budget Office (PBO) ahead of the July federal election.

The PBO’s 2016 post-election report, which details the budget impacts of various election commitments, notes that:

Parliamentary Budget Office, 2016 post-election report

The Greens propose abolishing fuel tax credits for all industries except agricultural businesses, ending accelerated asset depreciation for aircraft, the oil and gas industry and vehicles (except for those used for agricultural purposes), and a range of other measures.

Opinions differ on whether fuel tax credits constitute a “subsidy” or not.

Most fuel users have to pay a fuel excise of 39.5 cents per litre. But businesses can claim exemption from this obligation in certain circumstances. This exemption takes the form of a credit for the fuel tax (excise or customs duty) that’s included in the price of fuel.

These tax breaks include fuel excise exemptions for off-road use of fuel by the mining industry and primary producers. There’s also a partial rebate for large trucks (over 4.5 tonnes), the owners of which pay a road usage charge rather than the excise.

The PBO has estimated that the Australian Greens' proposal of abolishing the fuel tax credit for all industries except agricultural businesses would increase the budget balance by about A$4.5 billion a year.

Unpacking the assumptions

However, it’s worth detailing the assumptions that underpin these calculations.

First, the PBO says its costing assumes that business fuel usage does not change as a result of the policy. As the goal of a higher tax is to reduce fuel use and pollution, the PBO’s reported estimate will therefore be an overestimate of the revenue gain.

Also, uncertainty about the future means that all such revenue estimates are far from guaranteed. The PBO notes that:

Parliamentary Budget Office

Many consider the 39.5 cents a litre fuel excise a crude form of user-pays fee to cover the cost of government expenditures on public roads. The revenue raised by fuel excise of A$17.8 billion and state taxes on motor vehicles of A$9.5 billion for 2014-15 more than cover federal, state and local government spending on road construction, maintenance and other related costs.

This is the logical argument put forward by representatives of the mining industry for exemption from the fuel excise. They note that the mining industry builds and maintains its own roads. A similar argument applies for fuel used by primary industry for off-road purposes.

Others argue that fuel taxes help encourage people to use less of it, and thereby reduce pollution. However, a 39.5 cents per litre tax represents a very large tax per tonne of CO2 equivalent. If the fuel excise was regarded just as a tax on greenhouse gas emissions, the 39.5 cents per litre represents a tax of more than A$150 per tonne of greenhouse gas from the combustion of fuel – several times higher than the Gillard government’s A$24 per tonne carbon price, and the even lower European Union pollution permit price. It is stretching credibility to say the fuel excise is just a tax on pollution.

I’d argue in favour of the position taken in the 2010 Henry tax review, which recommended a roughly revenue-neutral reform package, replacing the current fuel excise and state motor vehicle taxes with a road user charge, a congestion tax and a pollution tax.

With this reform, the mining and agricultural industries would be exempt from the tax components on fuel for road funding and for congestion, but would pay a component for the external costs associated with greenhouse gas emissions.

John Freebairn does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond the academic appointment above.

More than 120 million of the world’s poorest depend on the coffee economy, a report says, and their livelihoods are already suffering from temperature rises

Climate change is going to halve the area suitable for coffee production and impact the livelihoods of more than 120 million of the world’s poorest people who rely on the coffee economy, according to a new report by the Climate Institute, commissioned by Fairtrade Australia & New Zealand.

The report findings follow stark warnings by some of the world’s biggest coffee producers, including Starbucks and Lavazza, who have said climate change is posing a severe risk to the industry.

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Millions of tonnes of food go into landfill each year. Food waste image from www.shutterstock.com

Around 4 million tonnes of food reaches landfill in Australia each year. This forms part of Australia’s organic waste, the country’s largest unrecovered stream of waste that goes into landfill.

There’s a missed opportunity here to recover this waste and do something useful with it. In particular, we can use it for energy such as biofuel. This forms part of a broader concept known as the “circular economy”.

In the absence of federal initiatives, state and local governments and communities are developing projects to foster a circular economy that can absorb this and other waste. This would then provide usable products to assist businesses and households and improve sustainability.

Simply disposing of waste in landfill affects households, businesses and governments. It requires time, energy and space, and poses environmental risks. When waste is repurposed for energy and fertiliser, it can give businesses a competitive edge, foster sustainable growth and create jobs.

The circular economy

A circular economy aims to bundle policy and business strategies into a system that works for everyone.

On a wider scale, circular economies underpin food security by reducing and reusing the amount of food waste, utilising byproducts and food waste and recycling nutrients as fertiliser.

While one way of repurposing food waste is to turn it into biofuel, a circular economy does not require all waste to be repurposed. Unwanted food can be given to the needy, or go into further processing. The idea is we extract every joule possible from organic matter, which may require multiple uses.

Some overseas governments have policies that compel businesses to keep their waste out of landfill. These countries are well on the way to developing circular economies. The star performers include Denmark, Japan, the Netherlands, Scotland and Sweden.

In Australia, the federal government has offered no such incentives. Instead, communities are taking it upon themselves to repurpose waste. State and local governments are introducing policies that offer incentives for recycling, or penalties for producing landfill.

There is a growing interest in co-digestion to boost biogas production, particularly for small wastewater facilities.

Co-digestion is the addition of other waste streams such as:

• municipal wastewater/sludge

• food and drink manufacturer process waste (including waste from the beverage, meat processing, dairy, brewing and wine industries)

• paper/pulp waste

• greasy waste/fats, oils and greases (from grease trap pump-outs)

• residential food and green waste (via trucked collection)

• residential/commercial food waste (organics rubbish bins)

• food waste (from supermarkets or supermarket chains).

So let’s have a look at recent advances around the country.

South Australia

Commissioned in 2013, South Australia Water’s Glenelg wastewater treatment is Australia’s first co-digestion facility. The addition of food byproducts such as milk, cheese, beer, wine and soft drink has increased power generation from 55% to 75% of the plant’s power requirement.

The South Australian government is developing a bioenergy roadmap. The aim is to link biomass suppliers in regions to users of energy and help to support local businesses to add value.

Victoria

Yarra Valley Water’s waste-to-energy facility is a new co-digestion development at Aurora Sewage Treatment Plant, north of Melbourne. It will process 100 cubic metres of waste each day. The waste is delivered by trucks from local commercial waste producers, such as markets and food manufacturing.

Through Sustainability Victoria, the state government is offering funding through the Advanced Organics Processing Technology Grants program, which supports the installation of small-scale onsite or precinct-scale anaerobic digestion technology for processing organic waste.

New South Wales

Australia’s best example of a community-driven circular economy is being developed in Cowra on the Lachlan River, part of the Murray-Darling catchment. This proposal shows the ability of state and local government, industry and farms to pool waste created in and around a country town to produce energy and fertiliser, which can be used within that same geographic circle.

The project will use two processes: anaerobic digestion and thermal recovery through either pyrolysis or torrefication (the breakdown of organic material at high temperature).

At full capacity, the Cowra biomass project will produce 60% of the town’s energy needs.

CLEAN Cowra: Creating a circular economy through aggregation of organic waste streams. MP= Meat processing; FP= Food processing; MRF= Materials recovery facility; WWTP= Waste water treatment plant; TR= Thermal recovery; AD= Anaerobic digestion; CHP= Combined heat and power. CLEAN Cowra

NSW’s council amalgamation process is also creating opportunities to link more waste producers and energy users through renewables that turn food, household and agricultural waste into power.

The NSW government’s Growing Community Energy grants have already helped the Cowra project.

The future?

The drive for communities and businesses to reap the rewards of extracting value from food waste is a result of an emerging trend in infrastructure planning, where the once parallel fields of water management, waste management and energy are teaming up.

It appears CLEAN Cowra and its regional and state equivalents are influencing the direction of federal government policy with relevant priority areas for ARENA being identified.

Whatever the driver, anything that can keep organic waste out of landfill has to be a good thing.

This topic will be discussed at this week’s Crawford Fund Conference.

Bernadette McCabe receives funding from Meat and Livestock Australia (MLA) and Australian Meat Processor Corporation (AMPC). She is a member of Bioenergy Australia and is National Team Leader for the International Energy Agency's (IEA) Bioenergy Task 37: Energy from Biogas.

Crewe Green, Cheshire This one has had a lucky escape; with more than half of its wings gone, it’s surprising it can fly at all. Butterflies may look ethereal and fragile, but they are survivors

A flock of starlings lift up from the damp grass and swerve in the harebell blue sky as I cycle by. It’s a mellow morning with a hint of a breeze. Ox-eye daisies and buttercups adorn the hedgerows, nodding their heads. There are big clouds of feathery white meadowsweet; I can smell its marzipan scent. To my left and right, jackdaws are flying over open fields drenched in light, the sun buttering their edges. A plaintive, cat-like mewling: a buzzard is circling.

The university grounds are practically deserted. I freewheel across the bridge. Below, the rippling brook glints like tiny pieces of bottle-green glass. Midges skim the surface and an iridescent dragonfly. There is a wasps’ nest in the far bank.

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A team of scientists has just completed an unusual experiment to find out what it would be like to experience life on Mars.

A combination of price falls in the international markets, driven by increased scale of manufacturing, and falling costs in Australia, driven by the ARENA tender process, is expected to trigger a major rush in investment in large scale solar projects.

Electricity market volumes and prices jumped on the NEM as a cold snap hit, while Infigen and ERM announced their annual results.

Infigen says securing contracts for renewable projects in Australia still very difficult, with obligated parties "simply passing through" higher costs to customers.

Singapore has confirmed 41 cases of the Zika virus in people who had not travelled to Zika-affected areas, meaning the virus has spread locally.

Australia's dirtiest coal fired generators will be given carte blanche to keep on emitting, or even increase their emissions under new baselines.

We're keeping tabs on barramundi; the Yandina farmers market explodes in a riot of colour; we meet a young woman with a passion for her hairy belted galloways; and we do the rounds during lambing time