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Every year tens of millions of Christmas Island red crabs migrate from the island’s dense forest to the cliffs to spawn. It’s a phenomenon that literally stops traffic and draws tourists from around the world to the tiny Australian territory.

But while there are still tens of millions of red crabs on the island, in recent years their numbers have dipped by around a third as they compete for space with (and struggle to fend off) a recently introduced pest: the yellow crazy ant.

The ants are having a significant impact on the island’s biodiversity, which relies on the red crab to maintain the forest understorey and keep the forest floor clean.

So what can be done to save Christmas Island’s biodiversity from yellow crazy ant supercolonies?

For the past few years a team of scientists have been hatching a plan to introduce a parasitical wasp to the island to cut the ant’s food supply. And in December they got the ball rolling on the delicate process of tipping the scales back in the crabs’ favour.

La Trobe University’s Matt Smith speaks with Peter Green, Head of the Department of Ecology, Environment and Evolution at La Trobe, about the impact of the yellow crazy ant and how his team’s plan to save the Christmas Island red crab is working in the first few months of its implementation.

Subscribe to The Conversation’s Speaking With podcasts on iTunes, or follow on Tunein Radio.

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Peter Green receives funding from the Department of Environment and Energy.

Patrick Barkham’s remarks on garden decking and wildlife loss (Notebook, 7 March) chime with research we undertook on the changes to garden vegetation in London over an eight-year period. We found that between 1998-99 and 2006-07, 3,000 hectares of vegetation disappeared from gardens, replaced by hard standing and decking. This loss, equivalent to 2.5 Hyde Parks each year, was compounded by the loss of 1m trees from gardens.  This period of change coincided with Ground Force’s time on television. Whether or not decking is now the culprit in gardens it once was, there’s evidence that artificial lawns – largely made from fossil fuels – are becoming the “new black”, again to the detriment of wildlife and the city’s ability to adapt to climate change.
Mathew Frith
Director of Conservation, London Wildlife Trust

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Move needed to drive orderly transition to low-emissions power sources, Investor Group on Climate Change says

The Turnbull government needs to put a price on carbon to unlock new investment in the electricity sector and drive an orderly transition to low-emissions power sources, according to the Investor Group on Climate Change.

The group, which represents major institutional investors in Australia and New Zealand, has used its submission to the Finkel review to argue that the government’s oft-repeated concerns about network reliability, energy affordability and emissions reductions will be addressed if concrete steps are taken to unlock new investment.

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UK leads Europe for solar growth despite drop in installations after government cut subsidies

The amount of solar power added worldwide soared by some 50% last year because of a sun rush in the US and China, new figures show.

New solar photovoltaic capacity installed in 2016 reached more than 76 gigawatts, a dramatic increase on the 50GW installed the year before. China and the US led the surge, with both countries almost doubling the amount of solar they added in 2015, according to data compiled by Europe’s solar power trade body.

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The Sentinel-2B spacecraft will take pictures to help create a complete map of Earth.

Report warns of catastrophic consequences and blames manufacturers for ‘systematic denial of harms’ and ‘aggressive, unethical marketing tactics’

The idea that pesticides are essential to feed a fast-growing global population is a myth, according to UN food and pollution experts.

A new report, being presented to the UN human rights council on Wednesday, is severely critical of the global corporations that manufacture pesticides, accusing them of the “systematic denial of harms”, “aggressive, unethical marketing tactics” and heavy lobbying of governments which has “obstructed reforms and paralysed global pesticide restrictions”.

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Claxton, Norfolk Wigeon boil up from the pools and the white lines across the males’ wings flash in the grey waves of their panic

I am in heaven in recent days. Buckenham marshes, across the river, is a mosaic of temporary splashes and mud-edged pools and, from the Yare’s raised bank, I can see how it’s smothered in late-winter pre-migration waders and wildfowl. All the flocking thousands are in turn the trigger for the presence of harriers and peregrines.

While the former circle continuously over the marsh, swinging and twisting in cold air, the peregrines are no more than ghosts, spooking the others into wild free-ranging chaos. However, I did have one extraordinary sighting: on the evening of the new moon, a male and female peregrine spearing in tandem towards the southern horizon. Both closed their wings into a long stoop and they fell across the sky until I could see them only as two unequal-sized drops of mercury, pulled by gravity into an ellipse.

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Main problem afflicting country’s grid is the lack of clear policy direction from Canberra, witnesses tell Senate inquiry

Senior executives from AGL Energy have given evidence that the main issue causing problems with reliable energy supply in South Australia is “dysfunction” in the gas market – not too many windfarms making the grid unreliable.

Executives from AGL told a Senate inquiry in Melbourne on Tuesday they would like to build a new gas-fired power station in South Australia to increase base load capacity in the state, but gas supply was chronically unreliable in the eastern states.

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Report finds Australia's policy focus on economic development is – still – at odds with the environment.

New study suggests biggest threat to Australia's energy security comes not from wind and solar, but from the control settings of coal and gas plants. It's a revelation that should turn the debate around renewables vs fossil on its head.

While the Finkel Review recognises Australia's “energy trilemma” – security, affordability and sustainability – we have a market that recognises only the first two of these objectives.

A key spacecraft in Europe's new multi-billion-euro Earth observation programme blasts into orbit.

US electric car sales jumped approximately 68% in February 2017 versus February 2016.

The call for applications for funding through Protecting National Historic Sites 2016-17 is now open.

This week wind power generated more than Scotland’s total electricity needs on four separate days.

CEFC sees limited role for gas generation in high renewables grid in Australia, due to competition from solar, high costs, and carbon risks.

Te promised outcomes of reform – cheaper and more reliable electricity, competitive markets and rational investment decisions – are further away than ever.

Warm weather ensured Arctic sea ice hit its lowest extent ever recorded for February.

Australia’s population growth and economic activity continue to pose major environmental challenges, according to a comprehensive five-yearly stocktake of the country’s environmental health.

The federal government’s State of the Environment 2016 report (prepared by a group of independent experts, which I chaired), released today, predicts that population growth and economic development will be the main drivers of environmental problems such as land-use change, habitat destruction, invasive species, and climate change.

These main pressures are broadly the same as those listed in the first ever State of the Environment report in 1996.

Yet since the last report in 2011, there have been some improvements in the state and trend of parts of the Australian environment. Our heritage (built, natural, and cultural) and marine environments are generally in good condition, as is the Australian Antarctic Territory. However, the Great Barrier Reef was affected significantly by Cyclone Yasi in 2011 and record high sea surface temperatures in 2015-16, resulting in extensive coral bleaching and die-off, particularly across the northern regions.

Pressures and changes

The new report shows that some individual pressures on the environment have eased since the 2011 report, such as those associated with air quality, poor agricultural practices and commercial offshore fishing, as well as oil and gas exploration and production in Australia’s marine environment.

During the same time, however, other pressures have increased, including those associated with coal mining and the coal-seam gas industry, habitat fragmentation and degradation, invasive species, litter in our coastal and marine environments, and greater traffic volumes in our capital cities.

Climate change is an increasingly important and pervasive pressure on all aspects of the Australian environment. It is altering the structure and function of natural ecosystems, and affecting heritage, economic activity and human well-being.

We continue to lose agricultural lands through urban encroachment. Over the past five years land-clearing rates stabilised in all states and territories except Queensland, where the rate of clearing increased.

Coastal waterways are threatened by pollutants, including microplastics and nanoparticles, which are largely unregulated and their effects poorly understood.

Since 2011, the coast has experienced several extreme weather events, including cyclones, heatwaves and floods. Climate-related pressures of sea level rise, more frequent severe storms, and subsequent erosion and recession of the shoreline are expected to become increasingly significant for coastal regions in the future.

Population growth in our major cities, along with Australia’s reliance on private cars, is leading to greater traffic volumes, which increase traffic congestion and delays as well as pollution.

Australia’s biodiversity is continuing to decline, with some exceptions, and new approaches are needed to prevent accelerating decline in many species. Since 2011, the list of nationally threatened species and ecological communities has lengthened, with the addition of 30 new ecological communities, and 44 animal and 5 plant species. Two species have been reported as probably extinct: the Bramble Cay melomys and the Christmas Island forest skink.

What’s more, because climate change will increase the existing threats, the capacity of the environment to adapt to climate change will be improved if other existing threats are addressed or ameliorated.

Grounds for optimism

For some parts of the Australian environment, at least, effective policy and management have contributed to improved outcomes for the environment and people.

Since 2011, Australia’s conservation estate has increased in size. The National Reserve System has grown significantly, largely through the addition of new Indigenous Protected Areas.

Early indications are that environmental watering in the Murray–Darling Basin, driven by the 2012 Murray–Darling Basin Plan, along with the effects of natural floods, have contributed to ecological benefits.

The formation of the National Offshore Petroleum Safety and Environmental Management Authority in 2012 has resulted in greater focus on industry compliance and increased levels of preparedness for unplanned events.

Technology is also changing the way in which environmental managers and policy-makers can access and use information to support decision-making and environmental management.

The new digital platform for the State of the Environment has delivered improved transparency and access to environmental data, making it more accessible to decision makers (including the private sector) and the public, but there remain data gaps to be filled.

There have been significant improvements in knowledge about the environment. In recent years, citizen science has expanded, resulting in improved observations of the environment that, in turn, provides knowledge to support more effective management.

However, we need to accelerate the process of improving environmental information, data and analysis between government, the private sector and civil society. The move towards a national system of environmental economic accounts is a promising development.

Challenges ahead

It is clear that some parts of Australia’s environment are not yet being managed sustainably, including invasive species and litter in our coastal and marine environments. There are several key challenges to the effective management of the Australian environment, including:

• Lack of a national policy establishing a clear vision for the long-term protection and sustainable management of our environment

• Poor collaboration and coordination of policies, decisions and management arrangements across sectors and between both public and private sector managers

• Insufficient resources for environmental management and restoration, and a lack of understanding of cumulative impacts.

State of the Environment 2016 is fundamentally different from its predecessors – with innovations that make it interactive and easier to track change over time.

Its consistent format provides environment policy makers and hands-on environmental managers with better visibility of changes, vital to understanding the condition of our environment and making informed decisions about its future.

It is grounded in the best available information and analysis, and builds on 20 years of experience in national reporting on the environment.

Meeting these challenges will require integrated policies and actions that address both the drivers of environmental change and their associated pressures.

Meeting this challenge will require scientists, governments, communities and businesses to all work together, and there are promising moves in this direction. For example, the Reef Life Survey brings together scientists, managers and citizen scientists to monitor shallow-reef biodiversity in nearly 90 locations around Australia. The appointment of a Threatened Species Commissioner in July 2014 is also helping to bring a national, collaborative focus to conservation efforts to address the growing number of native species in Australia facing extinction. Such efforts need to be encouraged and expanded.

William Jackson receives funding from the Australian Government Department of the Environment and Energy as Chief Author of Australia State of the Environment 2016.

Simple tips to avoid inhaling air from traffic and other common sources of pollution.