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In woods across the UK, an imported American stands higher and broader than the trees that surround it

A wooded ridge overlooking the Ouzel Valley in Bedfordshire has a remarkable set of trees sticking head and shoulders above the rest.

Credited with being able to grow into the world’s largest living thing, they can reach a height of 100 metres, nearly three times as high as a mature oak.

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In 2012 scientists succeeded in filming for the first time ever a giant squid in its natural habitat. EPA/NHK/NEP/DISCOVERY CHANNEL/AAP

It’s remarkable how little we know about Earth. How many species do we share this planet with? We don’t know, but estimates vary from millions to a trillion. In some respects we know more about the Moon, Mars and Venus than we do about the ocean’s depths and the vast sea floors.

But humans are inquisitive creatures, and we’re driven to explore. Chasing mythical or mysterious animals grabs media headlines and spurs debates, but it can also lead to remarkable discoveries.

The recent photographing of a live night parrot in Western Australia brought much joy. These enigmatic nocturnal birds have been only sporadically sighted over decades.

Another Australian species that inspires dedicated searchers is the Tasmanian tiger, or thylacine. A new hunt is under way, not in Tasmania but in Queensland’s vast wilderness region of Cape York.

This is the first photograph of a live night parrot, taken in Western Australia in March 2017. Bruce Greatwitch

Other plans are afoot to search for the long-beaked echidna in Western Australia’s Kimberley region.

In the case of the thylacine, old accounts from the region that sound very much like descriptions of the species raise the prospect that perhaps Cape York isn’t such a bad place to look after all.

But in reality, and tragically, it’s very unlikely that either of these species still survives in Australia. For some species there is scientific research that estimates just how improbable such an event would be; in the case of thylacines, one model suggests the odds are 1 in 1.6 trillion.

Chasing myths

The study and pursuit of “hidden” animals, thought to be extinct or fictitious, is often called cryptozoology. The word itself invites scorn – notorious examples include the search for Bigfoot, the Loch Ness Monster or Victoria’s legendary black panthers.

The search for Bigfoot is an extreme case of cryptozoology.

Granted, it’s probably apt to describe those searches as wild goose chases, but we must also acknowledge that genuine species – often quite sizeable ones – have been discovered.

Remarkable discoveries of animals thought to be fantasies or long extinct include giant squid, mountain gorillas, okapi, Komodo dragons and coelacanths.

In some cases, like the giant squid, these animals have been dismissed as legends. The reclusive oarfish, for example, are thought to be the inspiration for centuries of stories about sea serpents.

Oarfish can grow up to 8 metres long and swim vertically through the water. Commonly inhabiting the deep ocean, they occasionally come to shallow water for unknown reasons. AAP Image/ Coastal Otago District Office Technology to the rescue

Finding rare and cryptic species is self-evidently challenging, but rapid advances in technology open up amazing possibilities. Camera traps now provide us with regular selfies of once highly elusive snow leopards, and could equally be used with other difficult-to-find animals.

Candid camera, snow leopards in the Himalayas.

Environmental DNA is allowing us to detect species otherwise difficult to observe. Animal DNA found in the blood of leeches has uncovered rare and endangered mammals, meaning these and other much maligned blood-sucking parasites could be powerful biodiversity survey tools.

Acoustic recording devices can be left in areas for extended time periods, allowing us to eavesdrop on ecosystems and look out for sounds that might indicate otherwise hidden biological treasures. And coupling drones with thermal sensors and high resolution cameras means we can now take an eagle eye to remote and challenging environments.

Drones are opening up amazing possibilities for biological survey and wildlife conservation. The benefits of exploration and lessons learned

It’s easy to criticise the pursuit of the unlikely, but “miracles” can and do occur, sometimes on our doorstep. The discovery of the ancient Wollemi pine is a case in point. Even if we don’t find what we’re after, we may still benefit from what we learn along the way.

I’ve often wondered how many more species might be revealed to us if scientists invested more time in carefully listening to, recording and following up on the knowledge of Indigenous, farming, and other communities who have long and intimate associations with the land and sea.

Such an approach, combined with the deployment of new technologies, could create a boom of biological discovery.

Euan Ritchie receives funding from the Australian Research Council. Euan Ritchie is a Director (Media Working Group) of the Ecological Society of Australia, and a member of the Australian Mammal Society.

My father, Jon Vogler, who has died aged 77, used his skills as an engineer to set up the UK’s first large-scale recycling system. In 1974, when recycling at home was virtually unknown in Britain, Jon designed a household scheme in West Yorkshire for Oxfam called Wastesaver.

His innovative “dumpy” device, made of metal tubing, held four different coloured bags into which households sorted their waste. With the co-operation of Kirklees council, the sorted material was collected from 20,000 homes and taken to a disused mill in Huddersfield for recycling. The project revealed for the first time the public’s appetite for such schemes. When the collection of waste became unviable due to fluctuations in commodity prices, Wastesaver changed tack to deal with clothes and textiles.

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Ex Lib Dem MP Norman Baker has swapped the ‘constant battle’ of working with Theresa May for running a Brighton eco-firm that’s launching a green bus route

Vince Cable and Ed Davey, the former business and energy secretaries respectively, are among the Liberal Democrats that lost their seats in 2015 who are plotting their way back to parliament in this general election.

But an erstwhile colleague has rejected the opportunity to regain his seat in Lewes in East Sussex. Norman Baker, the former transport minister who later quit the Home Office in 2014 after finding working with Theresa May a “constant battle”, sighs: “I don’t need to do the same thing over and over again, that’s the definition of madness.

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Steve is a "remarkably common" gas ribbon in the upper atmosphere.

Kuki Gallmann, author of I Dreamed of Africa, is flown to hospital after an ambush, media say.

Designers and architects are exploring the potential of repurposed shipping containers, but critics say they are not necessarily sustainable or cost-effective

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Laeticia Brouwer, 17, was killed by a shark in Esperance on Easter Monday but Mark McGowan waited to comment as he did not want to politicise the issue

The premier of Western Australia remains in favour of personal devices to deter sharks instead of culling, nets and drumlines following the death of a 17-year-old girl.

Laeticia Brouwer was surfing with her father during a family holiday in Esperance on Easter Monday when she was mauled on the leg.

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Reforms are under way but not enough has been done to end poverty wages in the garment industry

Tomorrow is the anniversary of the 2013 Rana Plaza catastrophe, in which 1,134 garment workers in Bangladesh were killed when their factory collapsed. The workers died in the overcrowded and poorly constructed building while working to meet our demands for fast fashion.

Across the world conscious consumers will join fashionrevolution.org – a vibrant global civil movement focused on cleaning up the $3trn fashion industry, based primarily in low-wage economies.

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Mining has underpinned modern economies and generated great wealth, but what happens after the mining?

Pacific abandons one million hectare concession including indigenous peoples’ territories along Brazil border

A Canadian-headquartered company, Pacific Exploration and Production, has pulled out of a huge oil and gas concession overlapping a new national park in the Peruvian Amazon. The concession, Lot 135, includes approximately 40% of the Sierra del Divisor national park established in 2015.

The concession has provoked opposition in Peru and just across the border in Brazil for many years, including regular statements since 2009 from indigenous Matsés people in both countries and a lawsuit recently filed by regional indigenous federation ORPIO. Both Lot 135 and the park overlap territory used by the Matsés and a proposed reserve for indigenous people living in “isolation.”

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More than 600 marches took place around the world in events that coincided with Earth Day, with organizers saying science is ‘under attack’ from Trump

Hundreds of thousands of climate researchers, oceanographers, bird watchers and other supporters of science rallied in marches around the world on Saturday, in an attempt to bolster scientists’ increasingly precarious status with politicians.

The main March for Science event was held in Washington DC, where organizers made plans for up to 150,000 people to flock to the national mall. Marchers held a range of signs, some of them attacking Donald Trump, depicting the president as an ostrich with his head in the sand or bearing the words “What do Trump and atoms have in common? They make up everything.”

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Thousands of people gathered in demonstrations across the globe for the ‘March for Science’ on Saturday, in a rebuke of Donald Trump’s dismissal of climate science and his attempts to cut large areas of scientific research. People congregated in cities such as London, Sydney and Berlin, with more than 600 marches planned across the US, Europe, South America and Australia

• Global ‘March for Science’ protests call for action on climate change
  

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Labour says it would introduce legislation to tackle the "public health emergency" if in power.

Thousands of scientists demonstrate in cities around the world against an "assault on facts".

Climate change is a global pro-life issue

Readers of this column know that I tend to focus on breaking science in the climate and energy areas. Sometimes, I stray into politics and other times, I venture further afield. Today, on Earth Day, I was reflecting on best ways to move real action forward and it is clear to me, and almost everyone in this industry, that building bridges between like-minded groups is key.

Frankly, it isn’t just scientists that are concerned about climate change. Our concerns are shared by business leaders, the insurance industry, defense industries, people who enjoy the outdoors, farmers, and many more. Recently, there has been a movement amongst persons of faith as well. In fact, for some people of faith, taking care of the Earth is a mandate from a higher authority. In this light, and to celebrate a very different voice form my own, the following is a guest post by a well-known meteorologist in the USA, Paul Douglas. It turns out he is also a man of faith as well as a business leader. Thanks Paul.

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Hedgehogs, nursed back to health in an animal sanctuary, are released in the village of Burton Fleming, East Yorkshire.

An ingenious idea to build artificial glaciers at lower altitudes using pipes, gravity and night temperatures could transform an arid landscape into an oasis

The idea crystallised in his mind one morning as Sonam Wangchuk was crossing a bridge in the Indian Himalayas.

The engineer from Ladakh, in the Jammu region of north India, was already a famous problem solver: a Bollywood film loosely based on his life had grossed a billion rupees in its first four days.

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Exclusive: analysis commissioned by Labour reveals 59% of Britons live in areas where diesel pollution threatens health

Nearly 40 million people in the UK are living in areas where illegal levels of air pollution from diesel vehicles risk damaging their health, according to analysis commissioned by the Labour party.

The extent of the air pollution crisis nationally is exposed in the data which shows 59% of the population are living in towns and cities where nitrogen dioxide (NO2) pollution breaches the lawful level of 40 microgrammes per cubic metre of air.

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With a climate-change sceptic in the White House, marchers worldwide are today spreading a message of hope that protest and science can save the world

‘An exuberant rite of spring” is how the New York Times described 22 April, 1970. In Manhattan, and across America, “huge, light-hearted throngs ambled down autoless streets.” Earth Day had been born, an outburst of protest – and revelry – that involved everyone from save-the-whales activists to opponents of new freeways. Denis Hayes, now 72, was the man tasked with organising it. “What we did was pull together an event that told all of those people, ‘You know you’ve really got something in common and this should be one big movement where we’re supportive of one another’.”

It sparked, he tells me, the most profound change in American society since the New Deal. “We now have different kinds of buildings, different kinds of automobiles, different planes, different lighting, different land use. People are choosing to have diets for environmental reasons, choosing to have one child for environmental reasons.” And all that, he says, “didn’t come from political leadership at the top, it came from a bunch of demands down at the grassroots”.

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