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Citizen scientists are being sought for a project which will see tens of thousands of teabags buried in wetlands to monitor carbon sequestration

Australian scientists have launched a project to bury tens of thousands of teabags in wetlands around the world. They are hoping others will sacrifice a few cups of tea and join in to discover how efficient different wetlands are at capturing and storing carbon dioxide.

Lipton green tea and red tea “rooibos” varieties will be used in the project, which already involves more than 500 scientists in every continent except Antarctica.

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Banning cars on Saturdays in a heavily polluted city hasn't made the air any cleaner according to new research.

The British Antarctic Survey shifts its futuristic Halley base to keep it away from a watery grave.

A small but distinctive signal in X-rays from the Milky Way could be key to proving the existence of dark matter.

The Woodland Trust is calling on tree lovers to vote for their favourite entry in this year’s European contest that includes four British trees. The competition highlights the cultural importance of old trees and the need to protect them

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Transport secretary says airport expansion will bolster post-Brexit economy but critics warn over environmental obligations

Proposals for a third runway at Heathrow have been published for public consultation by the government as it declared that expanding the airport would show the world Britain was open for business after Brexit.

Related: Heathrow third runway plans published for public consultation

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‘Twenty-eight Climate Change Elevator Pitches’ delivers basic, accurate climate information

We know the climate is changing, the Earth is warming, and humans are the cause. As a scientist who studies this daily, I know the evidence is compelling and mutually reinforcing. In fact, the evidence is so compelling that it’s almost impossible to find scientists who disagree.

We also know that it’s possible to solve this problem using today’s technology. We don’t need to wait for fairy dust or cold fusion. Using energy more wisely, increasing renewable energy, modernizing nuclear power, and other actions are all things we can do right now to make the future better.

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A kestrel takes a shine to a Highways England CCTV camera at Junction 11a of the M5 in Gloucestershire. First spotted by traffic officers in October 2016, the kestrel is seen on separate occasions checking its reflection in the camera, struggling against high winds and being assailed by a magpie and a raven

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Even the cleanest coal plants add millions of tonnes of greenhouse gases to the atmosphere each year. Coal image from www.shutterstock.com

Following a campaign by the coal industry, Prime Minister Malcolm Turnbull has argued for new coal-fired power stations in Australia. But these plants would be more expensive than renewables and carry a huge liability through the carbon emissions they produce.

Major Australian energy companies have ruled out building new coal plants. The Australian Energy Council sees them as “uninvestable”. Banks and investment funds would not touch them with a barge pole. Only government subsidies could do it.

It may seem absurd to spend large amounts of taxpayers’ money on last century’s technology that will be more costly than renewable power and would lock Australia into a high-carbon trajectory.

But the government is raising the possibility of government funding for new coal plants, with statements by Deputy Prime Minister Barnaby Joyce, Treasurer Scott Morrison and Environment and Energy Minister Josh Frydenberg. The suggestion is to use funding from the Clean Energy Finance Corporation. For this to happen, presumably the CEFC’s investment mandate would need to be changed, or the meaning of “low-emissions technologies” interpreted in a radical way.

It should come to nothing, if minimum standards of sensible policy prevailed.

But an ill wind is blowing in Australia’s energy and climate policy debate. The situation in parliament is difficult, and the Trump presidency is giving the right wing in the Coalition a boost.

Definitely not ‘clean’

Proponents of new coal plants call them “clean coal”. They have appropriated a term that normally means burning coal in power stations with carbon capture and storage, a technology that filters out most of the carbon dioxide. But this is expensive and has made little progress.

Turnbull and others are simply suggesting Australia build the latest generation of conventional coal-burning plants. They are not clean – merely marginally less polluting than the old plants running now.

A new high-efficiency coal plant run on black coal would produce about 80% of the emissions of an equivalent old plant. An ultra-supercritical coal plant running on black coal emits about 0.7 tonnes of CO₂ per megawatt hour of electricity, or about 0.85 tonnes using brown coal. That is anything but clean.

For comparison, typical old “dirty” black coal plants in operation now emit around 0.9 tonnes, so the improvement from replacing them with the latest technology is not large. Gas plants produce between 0.4-0.6 tonnes, much less than the suggested new coal plants. Gas has the added benefit of being able to respond flexibly to demand. A plant with carbon capture and storage might emit around 0.05 tonnes, and renewables zero.

The Australian grid average right now is around 0.8 tonnes and gradually falling. New coal would tend to keep that average higher over the long term.

A single typically sized new coal plant could blow out in the order of 5 million tonnes of CO₂ each year – about 1% of Australia’s current annual emissions – and would have an expected lifetime of 40-60 years. It would also pollute the air locally, as all coal plants do, causing damage to people’s health.

If we wanted to make up for the extra coal emissions by doing more in industry, transport or agriculture, then this would come at a cost in those parts of the economy. In-depth research has shown that decarbonisation of Australia’s economy needs to have zero-carbon electricity supply at its core.

What if we don’t care about the climate?

Building coal power plants is expensive. The average lifetime cost of producing power with ultra-super critical plants in Australia is estimated at around A$80 per megawatt-hour. This assumes financing is available at standard interest rates and that the plant runs at high capacity.

Given the risk that the plants will be liable under stricter carbon limits in the future, the financing costs are bound to be higher, probably north of A$100 – and may be as much as A$160. If the plant is not fully utilised, as is already the case for existing coal plants, average costs will be even higher.

By comparison, wind farms now get built at an average cost of A$75 per megawatt-hour, and solar parks at around A$110. Both are expected to come down to perhaps A$50 by 2025. New coal plants take many years to prepare and build, so 2025 is the relevant comparison.

In fact, the overall comparison costs for renewables are even lower. This is because wind and solar built in 2025 would be replaced in the 2050s with even cheaper systems.

There are extra costs associated with wind and solar – for instance, through pumped-hydro storage or more gas-fired power plants to balance supply. But these costs are far less than the underlying cost of renewables.

So renewables including system integration costs will be cheaper than new coal plants, perhaps by quite a margin. Let’s say, very conservatively, that renewables are A$20 per megawatt-hour cheaper. For the coal plant that’d be an extra cost of A$150 million per year, or A$6 billion over 40 years. The extra cost could be much higher if the plant was retired before the 2060s or not run at full capacity.

The subsidy required would be potentially billions of dollars for each plant. That’s billions of dollars from the taxpayer or electricity user, in order to supply power with high carbon emissions that are then locked in for half a century. It should not happen in a country that prides itself on rational economic policy.

Instead, government should set its sights on the long-term economic opportunities for Australia in a low-carbon world, and chart a path for the transition of the energy system.

Turnbull referred to Australia’s position as a coal exporter. But a revolution is under way in energy technologies. While coal will continue to be used in existing plants, the times of growing coal use are over. Already more than 70% of the world’s annual power sector investment goes to renewables.

Australia is lucky in that there are no limits to the amount of renewable energy that could be produced. New industries can be built around it. We should invest in the industries of the future, not sink more money into the technologies of last century.

Frank Jotzo has received research grant funding from a number of sources, mostly government and the Australian Research Council.

Nomadic herders have killed wildlife and torched buildings but questions remain over the causes of the violence

Thousands of heavily-armed herders are invading conservancies, private properties and smallholdings in Laikipia, one of Kenya’s most important wildlife areas, as they search for pasture for their cattle.

Over the past couple of weeks, about 10,000 nomadic herders, armed with automatic rifles and driving 135,000 cattle, have left a trail of destruction and chaos in the county, just three hours drive from Nairobi. The herders have indiscriminately killed wildlife – from elephants, giraffes, zebras and lions to family dogs. Residents and tourists have been injured, some seriously. At least one person has been killed, according to reports.

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Solar power and clean cars are ‘gamechangers’ consistently underestimated by big energy, says Imperial College and Carbon Tracker report

Falling costs of electric vehicles and solar panels could halt worldwide growth in demand for oil and coal by 2020, a new report has suggested.

A scenario that takes into account the latest cost reduction projections for the green technologies, and countries’ pledges to cut emissions, finds that solar power and electric vehicles are “gamechangers” that could leave fossil fuels stranded.

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Plans for one million new homes by 2020 risk overwhelming drains, unless the government ends freeze on legal requirements for sustainable drainage

The rush to build one million new homes in England by 2020 is set to increase flooding by overwhelming drains, according to the nation’s building and flooding professionals.

The risk could be avoided, however, if the government ends its seven-year freeze on implementing legal requirements for new developments to include sustainable drainage systems (SuDS), such as ponds, green roofs and permeable paving. These slow the flow of water into drains, cutting the risk of floods.

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In recognition of Budj Bim’s outstanding heritage values the Australian Government has submitted a nomination to include the area on Australia’s World Heritage Tentative List.

Sun Bank, Teesdale Snow has a magical effect when the shadows emphasise features of this post-glacial landscape

If there was a league table for roadside laybys, ranked according to the grandeur of the landscape that they overlook, then this one, on the B6282 two miles east of Middleton-in-Teesdale, would be a strong contender.

It’s perched on the edge of a steep escarpment, high above the river Tees. With the valleyblanketed in snow, the bare branches of birch, alder and ash below stood out in minute detail, as if drawn on a blank canvas.

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Opponents of Pilliga state forest wells raise doubts about economic and environmental claims in fact sheet

Doubts have been raised about claims made in the environmental impact statement for Santos’ controversial plans to drill 850 coal seam gas wells in and around the Pilliga state forest.

The full statement has not been publicly released yet but questions are being raised about the economic and environmental claims in it, which are summarised in a “fact sheet” released by Santos.

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With the right mix, the grid can go fully renewable for the same cost and reliability as fossil fuels. Pixabay/Wikimedia Commons

In a speech to the National Press Club yesterday, Prime Minister Malcolm Turnbull declared that the key requirements for Australia’s electricity system are that it should be affordable, reliable, and able to help meet national emissions-reduction targets. He also stressed that efforts to pursue these goals should be “technology agnostic” – that is, the best solutions should be chosen on merit, regardless of whether they are based on fossil fuels, renewable energy or other technologies.

As it happens, modern wind, solar photovoltaics (PV) and off-river pumped hydro energy storage (PHES) can meet these requirements without heroic assumptions, at a cost that is competitive with fossil fuel power stations.

Turnbull and his government have also correctly identified energy storage as key to supporting high system reliability. Wind and solar are intermittent sources of generation, and while we are getting better at forecasting wind and sunshine on time scales from seconds to weeks, storage is nevertheless necessary to deliver the right balance between supply and demand for high penetration of wind and PV.

Storage becomes important once the variable renewable energy component of electricity production rises above 50%. Australia currently sources about 18% of its electricity from renewables – hydroelectricity in the Snowy Mountains and Tasmania, wind energy and the ever-growing number of rooftop PV installations.

Meanwhile, in South Australia renewable energy is already at around 50% - mostly wind and PV – and so this state now has a potential economic opportunity to add energy storage to the grid.

Pushing storage

To help realise this potential, in South Australia and elsewhere, the Clean Energy Finance Corporation (CEFC) and the Australian Renewable Energy Agency (ARENA) will spend A$20 million of public funds on helping flexible capacity and large-scale energy storage projects become commercially viable, including pumped hydro and batteries.

PHES constitutes 97% of worldwide electricity storage. The retail market for household storage batteries such as Tesla’s Powerwall is growing, but large-scale storage batteries are still much more expensive than PHES. “Off-river” pumped hydro has a bright future in Australia and many other countries, because there are very many suitable sites.

Wind and PV are the overwhelming winners in terms of new low-emissions electricity generation because they cost less than the alternatives. Indeed, PV and wind constituted half of the world’s new generation capacity installed in 2015 and nearly all new generation capacity installed in Australia.

Recently, we modelled the National Electricity Market (NEM) for a 100% renewable energy scenario. In this scenario wind and PV provide 90% of annual electricity, with existing hydro and bioenergy providing the balance. In our modelling, we avoid heroic assumptions about future technology development, by only including technology that has already been deployed in quantities greater than 100 gigawatts – namely wind, PV and PHES.

Reliable, up-to-date pricing is available for these technologies, and our cost estimates are more robust than for models that utilise technology deployment and cost reduction projections that are far different from today’s reality.

In our modelling, we use historical data for wind, sun and demand for every hour of the years 2006-10. Very wide distribution of PV and wind across the network reduces supply shortfalls by taking advantage of different weather systems. Energy balance between supply and demand is maintained by adding sufficient PHES, high-voltage transmission capacity and excess wind and PV capacity.

Not an expensive job

The key outcome of our work is that the extra cost of balancing renewable energy supply with demand on an hourly, rather than annual, basis is modest: A$25-30 per megawatt-hour (MWh). Importantly, this cost is an upper bound, because we have not factored in the use of demand management or batteries to smooth out supply and demand even more.

What’s more, a large fraction of this estimated cost relates to periods of several successive days of overcast and windless weather, which occur only once every few years. We could make substantial further reductions through contractual load shedding, the occasional use of legacy coal and gas generators to charge PHES reservoirs, and managing the charging times of batteries in electric cars.

Using 2016 prices prevailing in Australia, we estimate that the levelised cost of energy in a 100% renewable energy future, including the cost of hourly balancing, is A$93 per MWh. The cost of wind and PV continues to fall rapidly, and so after 2020 this price is likely to be around AU$75 per MWh.

Crucially, this is comparable with the corresponding estimated figure for a new supercritical black coal power station in Australia, which has been put at A$80 per MWh.

Meanwhile, a system developed around wind, PV and PHES and existing hydro can deliver the same reliability as today’s network. PHES can also deliver many of the services that enable a reliable energy system today: excellent inertial energy, spinning reserve, rapid start, black start capability, voltage regulation and frequency control.

Ageing system

Australia’s fossil fuel fleet is ageing. A good example is the pending closure of the 49-year-old Hazelwood brown coal power station in Victoria’s Latrobe Valley. An ACIL Allen report to the Australian Government lists the technical lifetime of each power station, and shows that two-thirds of Australia’s fossil fuel generation capacity will reach the end of its technical lifetime over the next two decades.

The practical choices for replacing these plants are fossil fuels (coal and gas) or existing large-scale renewables (wind and PV). Renewables are already economically competitive, and will be clearly cheaper by 2030.

Energy-related greenhouse gas emissions constitute about 84% of Australia’s total. Electricity generation, land transport, and heating in urban areas comprise 55% of total emissions. Conversion of these three energy functions to renewable energy is easier than for other components of the energy system.

Transport and urban heating can be electrified by deploying electric vehicles and heat pumps, respectively. Electric heat pumps are already providing strong competition for natural gas in the space and water heating markets. Importantly, these devices have large-scale storage in the form of batteries in vehicles, and thermal inertia in water and buildings. Well-integrated adoption of these technology changes will help reduce electricity prices further.

So wind, PV and PHES together yield reliability and affordability to match the current electricity system. In addition, they facilitate deep cuts to emissions at low cost that can go far beyond Australia’s existing climate target.

Andrew Blakers receives funding from the Australian Renewable Energy Agency.

Matthew Stocks receives funding from the Australian Renewable Energy Agency.

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

Better managing how we use electricity in our homes will reduce pressure on the grid, and reduce the need for more power stations.

The PM's call to arms on energy storage R&D is a welcome sign of forward policy thinking on renewables. Or is it?

Report says "exceptional" 2016 battery uptake points to even more remarkable growth in 2017, with 15 per cent of new solar installations expected to include storage, and a massive 70% of solar households looking to invest in a battery system.

South Australia’s energy minister, Tom Koutsantonis, responds to the federal government’s push for clean coal generation as an energy source for Australia’s future. He says ‘clean coal is a fairytale, clean coal doesn’t exist’, following calls by the prime minister, Malcolm Turnbull and his deputy, Barnaby Joyce

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