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Summer stayed into autumn in many parts of Australia. Bondi image from www.shutterstock.com

It’s the same old story: with 2016 on track to become the hottest year on record globally, and record-breaking heat already evident around the world, Australia has just experienced its hottest autumn on record.

Figures from the Bureau of Meteorology indicate Australia has experienced its hottest autumn on record. Bureau of Meteorology

The Bureau of Meteorology has reported that for average temperatures across Australia, this has been the hottest March-May period ever recorded – beating the previous record, set in 2005, by more than 0.2℃.

Within this period, March was also the hottest on record, while April and May were each the second-warmest in a series extending back to 1910.

Temperatures were well above average across much of the country, especially in the east. Bureau of Meteorology Why so hot?

El Niño events tend to cause warmer weather across the east and north of Australia and the major El Niño of 2015-16 undoubtedly contributed to the extreme temperatures experienced across these areas.

However, climate change also played a significant role in our warmest autumn. Previous work, led by ANU climatologist Sophie Lewis, indicates that the human influence on the climate has made a record-breakingly hot autumn roughly 20 times more likely.

In other words, without climate change we would be much less likely to experience autumns as warm as this one has been in Australia.

How we’ll remember autumn 2016

In the past few months, Australia has seen many extreme hot weather events. Melbourne experienced its warmest March night on record, while Sydney had a run of 39 days with daytime highs above 26℃, as the summer heat continued long into March.

But it’s the coral bleaching event on the Great Barrier Reef that will likely linger in our memories the longest. Some 93% of the reef was found to be affected by bleaching and recent surveys have revealed that more than one-third of coral in the northern and central parts of the reef have died.

Without climate change, a bleaching event like this would be virtually impossible.

The extreme heat over Australia this autumn and the associated damage to the reef are also having an effect on the election campaign. As public concern over the future of the reef grows, the parties are being asked to defend their climate change policies.

Both major parties have made election commitments to the reef, with the Coalition announcing an extra A$6 million to tackle crown-of-thorns starfish (adding to a further A$171 million committed under the 2016 budget), and Labor an extra A$377 million over five years (A$500 million in total). While both Labor and the Coalition aim to improve water quality in the reef through their policies, the coral bleaching and death this year is linked with warm seas.

Whether we’ll be able to save parts of the reef largely depends on whether we reduce our greenhouse gas emissions and manage to prevent the rising trend in temperatures from continuing.

Andrew King receives funding from the ARC Centre of Excellence for Climate System Science.

Shooters, Fishers and Farmers party MP Robert Borsak admits to shooting and eating an elephant while on a hunting trip in Zimbabwe. In a late-night sitting of New South Wales parliament on Tuesday, he defends his choice ‘to hunt and gather my own meat because it is my right to do so – it’s a clean, organic and sustainable way to live’

• Australian state MP admits eating elephant he shot in Zimbabwe
  
• Australia Greens leader views coral bleaching while snorkelling – video

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Energy inefficient and substandard construction in developing countries locking the world into high greenhouse gas emissions for decades, warns Fatih Birol

Buildings currently being constructed at an increasing rate in developing countries are locking the world into high greenhouse gas emissions for decades to come, the world’s leading authority on energy has warned.

Fatih Birol, executive director of the International Energy Agency, told the Guardian that the world’s number one priority in tackling climate change must be to ensure those buildings meet higher standards of efficiency and safety.

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While Tim Peake has been in space he has handed out Brit Awards, run the London Marathon, and even done a spacewalk.

From Tibetan monks playing basket ball with ice thawing high up in the Himalayas, to the pollution that hides behind the Taj Mahal, here’s our pick from 60 exceptional environmental photographs, by photographers and filmmakers from 70 countries, that will go on show at the Royal Geographical Society in London from 29 June to 21 August. The winners will be announced on 28 June

• Photographs provided by the Chartered Institution of Water and Environmental Management
  

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Captured by the XL Catlin Seaview Survey, these images show the extent of coral bleaching in the Indian Ocean archipelago of the Maldives. Scientists say this and similar devastation elsewhere in the world, including Australia’s Great Barrier Reef, are visible evidence of the impact of global warming

• Coral bleaching spreads to Maldives, devastating spectacular reefs

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Exclusive: Images from the Indian Ocean archipelago reveal the extent of the longest global coral bleaching event in history

• Coral bleaching in the Maldives – in pictures

The longest global coral bleaching event in history is now devastating reefs in the crystal clear waters of the Maldives, with images released exclusively to the Guardian powerfully illustrating the extent of the damage there.

Photographed by the XL Catlin Seaview Survey, the images captured the event in May as it moved beyond the now devastated Great Barrier Reef and into waters further west.

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Inclusion of the Warkworth Sands Woodland of the Hunter Valley on the list of threatened ecological communities, in the critically endangered category.

In 1991, Australia and other Antarctic Treaty Parties signed The Protocol on Environmental Protection to the Antarctic Treaty. It provides for the comprehensive protection of Antarctica's environment and bans mining and oil drilling.

Pact addresses concerns that burgeoning output from renewables is putting strain on electricity grid and pushing up prices

The German chancellor, Angela Merkel, has hammered out a deal with state premiers on the latest reform to Germany’s renewable energy law aimed at curbing the costs and controlling the speed of the roll-out of green power sources.

After a meeting with the leaders of Germany’s 16 states that stretched into the early hours of Wednesday, the government agreed to cap the expansion of onshore wind power at 2.8 gigawatts in capacity per year.

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Registrations open for Redflow tour and seminar, plus making Australia a renewable energy superpower

Returning to Alan Bennett’s old street to shoot The Lady in the Van threw up surprises for residents and crew

When a decrepit van, filled with a homeless old lady’s flotsam and jetsam, appeared with a film crew on Gloucester Crescent, 25 years after a similar vehicle had last been seen there, it proved a popular addition to the street for two people in particular.

“Camden Town is party central and when the crew turned up on one Monday morning they found a couple who’d been having a good time in the van,” says director Nicholas Hytner. “They’d apparently been there all weekend.

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The world added far more renewable energy sources than fossil fuels in 2015, with developing countries overtaking richer nations on green spending.

WATER SOURCE: Water-rich asteroids that bombarded the Moon between 4.5 billion and 4.3 billion years ago were the main source of water in the Moon's interior, suggests a new study.

MSPs will vote on whether to impose a full ban on fracking as part of an environment debate at Holyrood.

The world's longest, deepest rail tunnel just opened

The Australian Greens leader examines coral bleaching of the Great Barrier Reef while snorkelling at Lizard Island in Queensland. Richard Di Natale also dives at Michaelmas Cay, where he is joined by his deputy, Senator Larissa Waters. All footage provided by the Australian Greens

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Putting gorillas behind steel and glass might seem harsh, but these barriers help keep them safe. Tim/Zoo Atlanta Flickr/Wikimedia Commons, CC BY

The death of Harambe, a 17-year-old silverback Western lowland gorilla shot dead by Cincinnati Zoo staff after a four-year-old boy fell into his enclosure, has sparked anger and controversy.

One lesson we can take from this sad episode is the need to be realistic about the conditions in which gorillas and other captive animals live. If we accept that gorillas are going to be kept in zoos, we need to make sure those zoos don’t fail these animals by letting situations like this arise.

Harambe and the young boy.

Gorillas are obviously potentially dangerous to humans. We are a danger to them too, not least because our genetic closeness makes gorillas vulnerable to many human diseases.

As unpalatable as it seems to zoo visitors who might want to see animals living as “naturally” as possible, gorillas need to be kept behind glass, steel mesh or wide divides – for their own safety as well as ours.

Safety-first zoo design

One of the biggest questions about the Cincinnati Zoo incident is how the young boy could so easily have fallen into Harambe’s enclosure and come into direct contact with him. In light of this, there are certain principles that can be followed for the safe design of enclosures for large animals.

If an outdoor enclosure has some type of moat for containment, it may be a deep concrete moat with shallow water (less than 50cm) for gorillas to use without risk of drowning (gorillas can’t swim).

According to one set of recommendations, the typical minimum barrier should be 3.65 m high and 3.65 m across, but there is no law concerning minimum standards for gorilla enclosures. For extra security, a second barrier, sometimes electrified, is needed to keep people away.

In terms of minimum standards, the Cincinnati Zoo enclosure is suitable. But for great apes such as gorillas, it should no longer be acceptable simply to meet minimum standards. This is as true for containment as it is for the animals' other needs: space, complexity, and behavioural and psychological stimulation. The cost of building optimal enclosures for gorillas runs into millions of dollars, which places constraints on zoos who rarely have the funds to upgrade or redevelop enclosures. Who should fund these improvements?

All zoos have regulations and procedures to follow for risk management, including animal escape and recapture. Additional precautions are taken for all incidents or interactions with those considered dangerous species (such as big cats, great apes, elephants and so on).

There are strict legal requirements for protecting the public. But because of the rarity of such events, zoo staff may be inexperienced with situations involving human intruders (accidental or otherwise) in an exhibit.

Are gorillas ‘gentle giants’?

In 1996, a three-year-old boy fell into a similar enclosure at Brookfield Zoo. While the zoo visitors were also screaming and yelling, an eight-year-old female gorilla, Binti Jua, “rescued” the boy by carrying him to zoo staff at a side entrance. As animal researcher Marc Bekoff points out, Binti Jua was hailed as a gentle “heroine”, whereas Harambe was treated as a threat, but in both cases the gorillas were in situations where they had no control over the outcome.

It is impossible to say for certain whether Harambe would have become aggressive. He appeared to show behavioural signs of stress – hardly surprising given that people were shouting and screaming at him. Gorillas are sensitive and respond to non-verbal behaviour, such as towering over them or staring at them, which can be seen as a threat.

When faced with a stressful, noisy and threatening situation, gorillas – like most other animals, humans included – have a physiological “fight or flight” response. It is hard to predict how any individual will react under stress, but based on the video footage, Harambe did not appear to be behaving aggressively.

Silverbacks are powerful animals, weighing up to 180kg. When they are living in stable groups and not facing a threat, they are indeed gentle, but adult silverbacks can engage in infanticide when taking over a new family group.

A 2005 study found that the behaviour and welfare of gorillas in zoos are influenced by the number of people nearby, how close they are, and how much noise they are making. While zoo visitors can behave in almost any way they want, in the wild there are strict guidelines for tourists visiting gorillas.

To avoid disease transmission, behavioural disturbance and stress for wild gorillas, tourists who visit their native habitats must be over the age of 16, and in groups of no more than eight. The guidelines allow them to spend one hour quietly watching from a distance of about 10m.

Gorillas may be “gentle giants” when treated with respect and awe, but they are so much stronger than us.

Wild gorillas: look, but don’t touch. Augustine Tours/Wikimedia Commons, CC BY Expectations vs reality

When gorillas are housed in zoos, their exhibits must be designed from three perspectives: the safety and wellbeing of gorillas in the enclosure; the safety and satisfaction of visitors; and the safety and ease of maintenance by keepers and other staff.

These aims aren’t always mutually compatible. Zoo visitors might expect gorillas to be visible, active and “entertaining”, whereas the gorillas themselves are likely to seek quiet, secluded areas, and to spend much of their day resting or foraging.

Zoos and wild gorilla tourism sites must manage their visitors' expectations, so that all visitors understand that animal welfare and comfort take priority over optimal viewing.

We also can’t pretend that gorillas have control over their lives in captivity or even in natural habitats. They are impacted by human activities in all the places they live. Conservation is far more complicated than merely ensuring that gorillas have somewhere to live.

Zoo-based management programs have to deal with issues such as providing long-term care for old gorillas, who can reach 50 years of age. Captive breeding programs also have to deal with a “surplus” of males, because only a subset of silverbacks form family units or harems, which feature multiple females. In the wild there are many different group formations, including those with multiple silverbacks, but in captivity it is harder to manage social groups, as there is rarely space to separate individuals when aggression occurs.

Meanwhile, sanctuaries in Africa are struggling to care for orphaned gorillas as a result of the bushmeat trade. There is no truly safe wild haven for gorillas. Populations of critically endangered Western Lowland gorillas are declining, mainly as a result of the Ebola virus, which has killed thousands of gorillas in the Congo Basin, as well as commercial hunting and human disease.

Do gorillas belong in zoos? Why do zoo visitors want to see large animals in urban zoos? Are gorillas safer in the wild than inside enclosures and, if so, where? These are questions on which there will inevitably be strong differences of opinion.

But one thing we should all agree on is that we must strive to be compassionate and foster peaceful co-existence between people and other species, and work towards creating safe environments for gorillas with minimal human impact.

We can’t pretend that a moated enclosure without bars is any less of a cage than one with mesh. If keeping them safe in a zoo means putting a bigger barrier between us and them, or only letting us view them via hidden cameras as they live in a more protected and secluded exhibit, then so be it.

Carla Litchfield 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.

Water found deep in the Moon was delivered when icy asteroids splashed into magma oceans 4.3 billion years ago, a study suggests.

Orcas exist in every ocean, adapting to different conditions and diets. Genome sequencing has allowed insights into their evolution - and similarity to humans

Geneticists have deciphered the brief history of the killer whale: the predator that exists in every ocean but has evolved over the generations to hunt in disciplined packs, and specialise in a range of diets.

The lesson is that genetic mutations that may have favoured survival in changing circumstances were then enhanced by natural selection – and by social learning within killer whale family groups.

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