‘We need more people to go by bike’: meet Amsterdam’s nine-year-old junior cycle mayor

As the world’s first junior cycle mayor, Lotta Crok wants to draw attention to the obstacles kids on bikes face – and inspire other children to cycle

During Amsterdam’s chaotic rush hour, nine-year-old Lotta Crok cycles to a very busy junction. “Look,” she says. “There’s traffic coming from everywhere. Four trams from four different directions. For a child on a bike that’s really confusing!”

Lotta is the first junior cycle mayor in the world and her working area is the Dutch capital. It is her mission to inspire children to cycle every day and draw attention to the obstacles that kids on bikes are facing.

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Russian islands declare emergency after mass invasion of polar bears

Experts deployed to remove dozens of hungry bears besieging Novaya Zemlya

Analysis: what the polar bears reveal about the climate crisis

Russian environmental authorities have deployed a team of specialists to a remote Arctic region to sedate and remove dozens of hungry polar bears that have besieged the people living there.

The move came after officials in the Novaya Zemlya archipelago, with a population of about 3,000 people, appealed for help.

“There’s never been such a mass invasion of polar bears,” said Zhigansha Musin, the head of the local administration. “They have literally been chasing people.”

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The barefoot engineers of Malawi – in pictures

Eight women from rural Malawi travelled to India to train as solar engineers. Now they are lighting the way for their communities, in a country where just 10% of households are powered by electricity

Photographs by Peter Caton/VSO

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Plummeting insect numbers ‘threaten collapse of nature’

Exclusive: Insects could vanish within a century at current rate of decline, says global review

The world’s insects are hurtling down the path to extinction, threatening a “catastrophic collapse of nature’s ecosystems”, according to the first global scientific review.

More than 40% of insect species are declining and a third are endangered, the analysis found. The rate of extinction is eight times faster than that of mammals, birds and reptiles. The total mass of insects is falling by a precipitous 2.5% a year, according to the best data available, suggesting they could vanish within a century.

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‘Wiped out before our eyes’: Hawaii offers bold plan to stop shark killings

Proposal law would protects any shark or ray in state waters and be first of its kind in US

Sharks could soon become more numerous in Hawaii waters – and advocates say that’s a good thing.

Lawmakers in Honolulu advanced a proposed ban on killing sharks in state waters on Wednesday, after receiving hundreds of calls and letters of support from around the country. The law, which would provide sweeping protection for any shark, rather than select species, could be the first of its kind in the United States.

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Evacuation alert at Vale-owned mine in Brazil two weeks after disaster

Five hundred people told to leave area around Sul Superior tailings dam at mine near Belo Horizonte

Brazilian authorities have ordered the mining company Vale to evacuate hundreds of people from the vicinity of a dam in Minas Gerais, two weeks after a dam breach at another Vale mine in the state killed an estimated 300 people.

Vale said it was evacuating 500 people from three communities around the Sul Superior tailings dam at the Gongo Soco mine, near Belo Horizonte, on the orders of the national mining agency. It said it was a preventive measure after an engineering consulting firm, Walm, refused to give the dam a declaration of stability.

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The battle for the future of Stonehenge

Britain’s favourite monument is stuck in the middle of a bad-tempered row over road traffic. By Charlotte Higgins

Stonehenge, with the possible exception of Big Ben, is Britain’s most recognisable monument. As a symbol of the nation’s antiquity, it is our Parthenon, our pyramids – although, admittedly, less impressive. Neil MacGregor, the former director of the British Museum, recalls that when he took a group of Egyptian archaeologists to see it, they were baffled by our national devotion to the stones, which, compared to the refined surfaces of the pyramids, seemed to them like something hastily thrown up over a weekend.

Unlike those other monuments, though, Stonehenge is more or less a complete mystery. Nobody knows for sure why, or by whom, this vast arrangement of boulders was erected on Wiltshire’s downlands, in the south of England, about 5,000 years ago. Into this void have rushed myriad theories, from the academically sober to the blatantly fantastic. Over the centuries, its construction has been confidently credited to giants, wizards, Phoenicians, Mycenaeans, Romans, Saxons, Danes and aliens. (According to one medieval theory, Merlin had it transported from Ireland to serve as the funeral monument for Britons slaughtered by Hengist, the treacherous Saxon.)

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Australia can meet its Paris targets – if government doesn’t hinder progress

ANU research suggests net cost of achieving Paris targets is zero because renewables are now cheaper than fossil fuels

New research finds Australia is installing renewable energy faster than any other country, a trend that will allow Australia to meet its economy-wide Paris targets five years ahead of schedule if politics doesn’t derail the trend, according to new research from the Australian National University.

While emissions have been rising across the economy since the Abbott government repealed the carbon price after winning government in 2013, they have been falling in the electricity sector because of the closure of ageing coal plants and the rapid uptake of renewables.

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Cavity two-thirds the size of Manhattan discovered under Antarctic glacier

Disintegration of rapidly melting Thwaites ice mass could threaten coastal communities worldwide

Scientists have discovered a giant cavity at the bottom of a disintegrating glacier in Antarctica, sparking concerns that the ice sheet is melting more rapidly than expected.

Researchers working as part of a Nasa-led study found the cavern, which they said was 300 metres tall and two-thirds the size of Manhattan, at the bottom of the massive Thwaites glacier.

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‘That’s going to burst’: Brazilian dam workers say they warned of disaster

Fears and repairs preceded January collapse in which 134 people died and 199 are still missing, near Brumadinho in Minas Gerais state

The Brazilian mining dam which collapsed in January, killing hundreds of people, suffered a leak last year that compromised its safety, according to employees who allege the mine’s operators did not inform the workforce or relocate a canteen and administration building that were destroyed in the disaster.

One hundred and forty-two people died and 194 are still missing after the dam near Brumadinho in Minas Gerais state collapsed on 25 January.

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Working USB stick found in leopard seal’s year-old frozen faeces

New Zealand puts out call to find owner of memory stick spotted in frozen poo sample

A functioning USB stick has been found in the scat of a rare Antarctic leopard seal, prompting New Zealand’s national science body to launch a hunt for the owner.

Volunteers at the National Institute of Water and Atmospheric Research (Niwa) recovered the device while examining the animal’s frozen faeces – which had been sitting in a freezer for over a year.

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‘Beggars belief’: more endangered parrots exported from Australia

Warren Entsch demands investigation after German convicted kidnapper boasts about new shipment

A government MP has said it “beggars belief” that more endangered Australian birds have been exported to a German organisation headed by a convicted kidnapper and extortionist, after a Guardian investigation revealed there had been multiple warnings that the birds could be sold to collectors at a huge profit.

Warren Entsch repeated calls for an independent investigation into how the Association for the Conservation of Threatened Parrots was able to receive hundreds of rare and endangered birds from Australia, after its founder, Martin Guth, used a social media post to say more endangered species had arrived at its facilities in January.

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‘We have to learn to live with floods’: waterlogged Surat to become latest megacity

The next 15 megacities #14: Surat’s battle to hold back water has raged since its first flood wall in 1664. As its population soars, India’s ‘diamond city’ needs new solutions

Look up as you walk around Surat and you might spot “HFL 8.8.2006” daubed in red paint on a wall above your head. HFL stands for “high flood level”, and the inscriptions are 15 feet above the ground in places – a fading memory of the devastating floods of August 2006, which killed 150 people, according to official estimates (unofficial counts put the death toll at over 500). More than 60% of the city was underwater and damage was estimated at $2bn.

Surat’s geography – it lies at the mouth of the Tapi river, near the Arabian Sea – makes it prone to flooding, and it experiences a major inundation every four years on average.

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A third of Himalayan ice cap doomed, finds report

Even radical climate change action won’t save glaciers, endangering 2 billion people

At least a third of the huge ice fields in Asia’s towering mountain chain are doomed to melt due to climate change, according to a landmark report, with serious consequences for almost 2 billion people.

Even if carbon emissions are dramatically and rapidly cut and succeed in limiting global warming to 1.5C, 36% of the glaciers along in the Hindu Kush and Himalaya range will have gone by 2100. If emissions are not cut, the loss soars to two-thirds, the report found.

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Australian authorities deliberately flood 2,000 Queensland homes after record downpours

State government warns residents to beware of crocodiles and snakes, which were reportedly heading into suburban areas

After eight days of heavy monsoonal rain, authorities in the north Queensland city of Townsville had no choice but to open the floodgates of the Ross River Dam, deliberately flooding about 2,000 homes.

The decision was made as the Queensland government also published a warning to people to beware of crocodiles, snakes and other wildlife, which were reported to have left the swollen river and headed into some suburban areas.

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Queensland flooding: thousands of homes in Townsville under threat as waters rise – live

Torrential rain forces authorities to open Ross River dam floodgates, releasing 1,900 litres a second in ‘once-in-a-century flood’. Follow all the developments • Townsville floods: Queensland premier warns ‘we haven’t got to the peak’

At this stage, authorities expect the Ross River to peak about 11am, and for the peak to last most of today.

That’s potentially good news for Townsville residents, especially those under threat but not yet underwater. It’s also a sign that the flood emergency is unlikely to end any time soon.

Overnight, Townsville residents were warned to stay out of the water – and for good reason. A number of crocodiles sightings have been reported, while the authorities also warned of snakes in the water.

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Dam collapse: the desperate search at Brazil’s ‘ground zero’

More than 230 remain missing after an avalanche of liquid mining waste swept through the countryside of Minas Gerais

Helicopters clattered overhead as teams of men and sniffer dogs picked their way across the few areas of red mud solid enough to walk on. Other recovery teams gathered around a digger as its shovel scooped up the sludge and drained it, again and again.

Related: Brazil dam collapse: bodies pulled from toxic mud as hope fades for survivors

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Brazil: shocking new video captures moment of deadly dam collapse

Footage shows destructive torrent of mining waste, while ceremony pays homage to 110 victims

A week after the deadly collapse of a mining dam in the Brazilian state of Minas Gerais, dozens paid homage to the 110 victims killed and 238 who are still missing, while newly released video footage showed the moment that a powerful wave of waste began sweeping over everything in its path.

A ceremony was held at the site of the disaster around 1pm local time, the hour at which the dam breached on 25 January, unleashing a destructive torrent of reddish-brown mining waste.

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Officials warn of putrefying piles of rubbish after no-deal Brexit

Exclusive: leaked emails show officials planning crisis centres to manage halt in waste exports to EU

Government officials are preparing to deal with “putrefying stockpiles” of rubbish in the event of a no-deal Brexit, according to documents leaked to the Guardian.

If the UK leaves the EU without a deal on 29 March, export licences for millions of tonnes of waste will become invalid overnight. Environment Agency (EA) officials said leaking stockpiles could cause pollution.

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