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Iranian Cheetah Society says situation is critical as numbers of the subspecies continue to dwindle

Conservationists say only two female Asiatic cheetahs are known to be alive in the wild in Iran, which hosts the last surviving population.

Asiatic cheetahs, also known as Iranian cheetahs, are a subspecies of the fastest animal on earth and classified as critically endangered, with fewer than 40 believed to remain in Iran.

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Astronomers in the US have uncovered previously unknown objects in the outer reaches of the Solar System.

A genetic study uncovers signs that wild Tasmanian devils are rapidly evolving to fight back against the infectious face cancer threatening them with extinction.

Several manufacturers have launched models that produce more pollutants when driven in real-world conditions

New diesel cars are still emitting many times the official limit for polluting nitrogen oxides when driven on the road, almost a year after the Volkswagen emissions scandal broke.

Renault, Mercedes-Benz, Mazda and Hyundai have all launched diesel models in 2016 with NOx emissions that are far higher than the official lab-based test when driven in real-world conditions, according to tests by Emissions Analytics (EA), a company whose data is used by the manufacturers of most cars sold in Europe.

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DNA has been successfully sequenced in space for the first time.

With the planet at a crossroads, September will bring two crucial global conferences on the urgent issue of how best to protect endangered species

Consumers and collectors want sturgeon caviar, snakeskin bags, shark meat and fins, wild snowdrop bulbs, precious rosewood furniture, and quality agarwood oil, as well as rare birds, reptiles, cacti and orchids. But they rarely stop to think about their origins. There are now over seven billion people consuming biodiversity every day in the form of medicines, food, clothing, furniture, perfumes and luxury goods. Demand for products drawn from nature is increasing, and with it pressure is growing on some of our wildlife species.

Our capacity to harvest from the wild has no limits, and modern transport has no frontiers. There are 1.1 billion international tourist arrive a year, 100,000 flights every day, and 500 million containers are shipped a year, allowing wildlife products to reach the four corners of the earth, legally or illegally. The tensions between boosting global trade, promoting development and conserving wildlife persist, in what sometimes seems like a set of objectives that are pulling in opposite directions.

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Report was expected in July and concerns have been raised that there will not be time to implement recommendations before winter

MPs and council leaders have written to Theresa May seeking assurances after a delay in the publication of a government report on the UK’s flood defences.

The national flood resilience review was established to assess how the country can be better protected from flooding and increasingly extreme weather events, and its report had been expected in July.

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Luxembourg-based SES says it is going to be the first satellite operator to launch a spacecraft on a "second-hand" rocket - a Falcon 9 that previously sent supplies to the space station.

A report launched on 3 August by Unesco’s World Heritage Centre and International Union for Conservation of Nature (IUCN) explores the importance of marine life in the open ocean, which covers more than half the planet

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One of Australia's best-known landmarks, Uluru, has been filmed from a new perspective.

Badger culling is rolled out to more parts of England, in a bid to tackle bovine TB.

Records of temperature that go back far further than 1800s suggest warming of recent decades is out of step with any period over the past millennium

The planet is warming at a pace not experienced within the past 1,000 years, at least, making it “very unlikely” that the world will stay within a crucial temperature limit agreed by nations just last year, according to Nasa’s top climate scientist.

This year has already seen scorching heat around the world, with the average global temperature peaking at 1.38C above levels experienced in the 19th century, perilously close to the 1.5C limit agreed in the landmark Paris climate accord. July was the warmest month since modern record keeping began in 1880, with each month since October 2015 setting a new high mark for heat.

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Aviva, Aegon and Amlin issue joint statement urging leaders to build on previous commitments and end subsidies within four years, reports Climate Home

Three of the world’s biggest insurers have called on G20 leaders to implement a timeframe for ending fossil fuel subsidies when they meet in China this week.

The G20 has already committed to phase out “inefficient fossil fuel subsidies that encourage wasteful consumption” over the “medium term”. In May, the G7 nations pledged to achieve this by 2025.

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Ten areas now licensed for culling, with Herefordshire, Cornwall and Devon added to Gloucestershire, Somerset and Dorset

The number of areas where badgers will be culled to stop the spread of bovine tuberculosis is to more than triple under licences issued by the government on Tuesday.

Licensed shooters could begin killing badgers within days in Herefordshire, Cornwall and Devon, which have been added to the culling already taking place in recent years in Gloucestershire, Somerset and Dorset.

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Scientists investigating whether we have entered a new geological age are seeking a suitable "spike" in the environmental record that betrays significant human influence.

Small-scale fishers hope technology will convince ministers that there are enough stocks to feed communities sustainably

A smartphone app that logs data on fish catches is giving small-scale fishers in South Africa hope they can persuade the government to allocate them more of what they regard as their traditional fishing rights.

Abalobi, the app which is named for the isiXhosa phrase abalobi bentlanzi, meaning “someone who fishes”, aims to give small-scale fishers the data to empower themselves and convince others.

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The Victorian government will introduce legislation that will permanently ban the exploration and development of unconventional gas.

Hello humans. US Department of Energy/Wikimedia Commons

It’s literally epoch-defining news. A group of experts tasked with considering the question of whether we have officially entered the Anthropocene – the geological age characterised by humans' influence on the planet – has delivered its answer: yes.

The British-led Working Group on the Anthropocene (WGA) told a geology conference in Cape Town that, in its considered opinion, the Anthropocene epoch began in 1950 – the start of the era of nuclear bomb tests, disposable plastics and the human population boom.

The Anthropocene has fast become an academic buzzword and has achieved a degree of public visibility in recent years. But the more the term is used, the more confusion reigns, at least for those not versed in the niceties of the underpinning science.

Roughly translated, the Anthropocene means the “age of humans”. Geologists examine layers of rock called “strata”, which tell a story of changes to the functioning of Earth’s surface and near-surface processes, be these oceanic, biological, terrestrial, riverine, atmospheric, tectonic or chemical.

When geologists identify boundaries between layers that appear to be global, those boundaries become candidates for formal recognition by the International Commission on Stratigraphy (ICS). The commission produces the International Chronostratigraphic Chart, which delimits verified changes during the planet’s 4.5 billion-year evolution.

Earth’s history, spiralling towards the present. USGS/Wikimedia Commons

The chart features a hierarchy of terms like “system” and “stage”; generally, the suffix “-cene” refers to a geologically brief stretch of time and sits at the bottom of the hierarchy. We have spent the past 11,500 years or so living in the so-called Holocene epoch, the interglacial period during which Homo sapiens has flourished.

If the Holocene has now truly given way to the Anthropocene, it’s because a single species – us – has significantly altered the character of the entire hydrosphere, cryosphere, biosphere, lithosphere and atmosphere.

The end of an era?

Making this call is not straightforward, because the Anthropocene proposition is being investigated in different areas of science, using different methods and criteria for assessing the evidence. Despite its geological ring, the term Anthropocene was coined not by a geologist, but by the Nobel Prize-winning atmospheric chemist Paul Crutzen in 2000.

He and his colleagues in the International Geosphere-Biosphere Program have amassed considerable evidence about changes to everything from nutrient cycles to ocean acidity to levels of biodiversity across the planet.

Comparing these changes to those occurring during the Holocene, they concluded that we humans have made an indelible mark on our one and only home. We have altered the Earth system qualitatively, in ways that call into question our very survival over the coming few centuries.

Crutzen’s group talks of the post-1950 period as the “Great Acceleration”, when a range of factors – from human population numbers, to disposable plastics, to nitrogen fertiliser – began to increase exponentially. But their benchmark for identifying this as a significant change has nothing to do with geological stratigraphy. Instead, they ask whether the present period is qualitatively different to the situation during the Holocene.

Rocking out

Meanwhile, a small group of geologists has been investigating the stratigraphic evidence for the Anthropocene. A few years ago a subcommission of the ICS set up the Anthropocene working group, which has now suggested that human activity has left an indelible mark on the stratigraphic record.

The major problem with this approach is that any signal is not yet captured in rock. Humans have not been around long enough for any planet-wide impacts to be evident in Earth’s geology itself. This means that any evidence for a Holocene-Anthropocene boundary would necessarily be found in less permanent media like ice sheets, soil layers or ocean sediments.

The ICS has always considered evidence for boundaries that pertain to the past, usually the deep past. The WGA is thus working against convention by looking for present-day stratigraphic markers that might demonstrate humans’ planetary impact. Only in thousands of years' time might future geologists (if there are any) confirm that these markers are geologically significant.

In the meantime, the group must be content to identify specific calendar years when significant human impacts have been evident. For example, one is 1945, when the Trinity atomic device was detonated in New Mexico. This and subsequent bomb tests have left global markers of radioactivity that ought still to be evident in 10,000 years.

Alternatively, geographers Simon Lewis and Mark Maslin have suggested that 1610 might be a better candidate for a crucial human-induced step change. That was the year when atmospheric carbon dioxide dipped markedly, suggesting a human fingerprint linked to the New World colonists' impact on indigenous American agriculture, although this idea is contested.

Decision time

The fact that the WGA has picked a more recent date, 1950, suggests that it agrees with the idea of defining the Great Acceleration of the latter half of the 20th century as the moment we stepped into the Anthropocene.

It’s not a decision that is taken lightly. The ICS is extremely scrupulous about amending the International Chronostratigraphic Chart. The WGA’s suggestion will face a rigorous evaluation before it can be scientifically accepted by the commission. It may be many years before it is formally ratified.

Elsewhere, the term is fast becoming a widely used description of how people now relate to our planet, rather like the Iron Age or the Renaissance. These words describe real changes in history and enjoy widespread use in academia and beyond, without the need for rigorously defined “boundary markers” to delimit them from prior periods.

Does any of this really matter? Should we care that the jury is still out in geology, while other scientists feel confident that humans are altering the entire Earth system?

Writing on The Conversation, geologist James Scourse suggests not. He feels that the geological debate is “manufactured” and that humans' impact on Earth is sufficiently well recognised that we have no need of a new term to describe it.

Clearly, many scientists beg to differ. A key reason, arguably, is the failure of virtually every society on the planet to acknowledge the sheer magnitude of the human impact on Earth. Only last year did we finally negotiate a truly global treaty to confront climate change.

In this light, the Anthropocene allows scientists to assemble a set of large-scale human impacts under one graphic conceptual banner. Its scientific status therefore matters a great deal if people worldwide are at long last to wake up to the environmental effects of their collective actions.

Gaining traction

But the scientific credibility of the Anthropocene proposition is likely to be called into question the more that scientists use the term informally or otherwise. Here the recent history of climate science in the public domain is instructive.

Even more than the concept of global warming, the Anthropocene is provocative because it implies that our current way of life, especially in wealthy parts of the world, is utterly unsustainable. Large companies who make profits from environmental despoliation – oil multinationals, chemical companies, car makers and countless others – have much to lose if the concept becomes linked with political agendas devoted to things like degrowth and decarbonisation. When one considers the organised attacks on climate science in the United States and elsewhere, it seems likely that Anthropocene science will be challenged on ostensibly scientific grounds by non-scientists who dislike its implications.

Sadly, such attacks are likely to succeed. In geology, the AWG’s unconventional proclamation potentially leaves any ICS definition open to challenge. If accepted, it also means that all indicators of the Holocene would now have to be referred to as things of the past, despite evidence that the transition to a human-shaped world is not quite complete in some places.

Some climate contrarians still refuse to accept that researchers can truly distinguish a human signature in the climate. Similarly, scientists who address themselves to the Anthropocene will doubtless face questions about how much these changes to the planet are really beyond the range of natural variability.

If “Anthropocene sceptics” gain the same momentum as climate deniers have enjoyed, they will sow seeds of confusion into what ought to be a mature public debate about how humans can transform their relationship with the Earth. But we can resist this confusion by recognising that we don’t need the ICS’s imprimatur to appreciate that we are indeed waving goodbye to Earth as we have known it throughout human civilisation.

We can also recognise that Earth system science is not as precise as nuclear physics or geometry. This lack of precision does not mean that the Anthropocene is pure scientific speculation. It means that science knows enough to sound the alarm, without knowing all the details about the unfolding emergency.

The Anthropocene deserves to become part of our lexicon – a way we understand who we are, what we’re doing and what our responsibilities are as a species – so long as we remember that not all humans are equal contributors to our planetary maladies, with many being victims.

Noel Castree 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.

For the first time, Australia has been brought before a UN Commission to arbitrate its dispute with Timor-Leste over maritime boundaries.

Monsoon floods in the Ganges river have broken previous records in four locations in northern India, officials tell the BBC