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Could a mountain grow to greater heights than Everest? (Image credit: sansubba)

Sixty million years ago, when the Eurasian plate slammed into the Indian plate, a mountain range was born. Because these plates were of similar density, neither could sink below the other. The rocks had nowhere to go but up.

Now, the Himalayas host Earth’s tallest mountains. Mount Everest is the tallest, towering 5.4 miles (8.8 kilometers) above sea level. After Everest, the tallest is K2, which rises 5.3 miles (8.6 km) above Earth’s surface. 

Could these mountains be any higher? For that matter, how high could any mountain grow on Earth?

Theoretically, a mountain could be “quite a bit taller than Everest,” Gene Humphreys (opens in new tab) , a geophysicist at the University of Oregon, told Live Science. But first it would have to overcome a few challenges that many mountains face as they grow.

For instance, because of Earth’s gravitational pull, any pile of rock that grows into a mountain will start to slouch, “much like a wad of bread dough will slowly flatten when placed on a table,” Humphreys said.

Related: Is Mount Everest really the tallest mountain on Earth?

Active processes, like erosion, also help keep mountains from growing too tall. Glaciers, vast blocks of slowly moving ice, are especially good at carving up mountains.

The peak of Mount Everest sites above the clouds of Tibet. (Image credit: Nicole Kucera)

Earth scientists refer to glacial erosion as “the glacial buzzsaw because they are so effective at taking the sides off of mountains,” Humphreys said. “[Glacial erosion] creates a steep-sided mountain that is then prone to landsliding.”

The effects of erosion and gravity mean that “the bigger the mountain, the greater the stresses created by gravity and the stronger the tendency to collapse,” Humphreys said. And although Mount Everest “could conceivably get elevated yet higher, its steep south side seems unstable,” which might lead to landslides.

However, there are ways a mountain could grow taller than Everest, Humphreys continued. Possibly even 1 mile (1.6 km) taller — but only if the conditions were just right. First, it’d have to be formed from volcanic processes rather than from continental collision. Volcanic mountains, like the Hawaiian Islands, grow as they erupt. Lava flowing out of the volcanoes cools in layers, building the volcanoes higher and higher. And finally, for the mountain to keep growing, it would need a continuing source of magma pumped higher and higher, allowing it to erupt, flow down the mountain’s sides, and cool. 

This volcanic process is exactly how the solar system’s tallest mountain, Mars’ Olympus Mons, formed. Towering 16 miles (25 km), Olympus Mons is so tall that it actually pokes through the top of the Red Planet’s atmosphere, Briony Horgan (opens in new tab) , a planetary scientist at Purdue University in Indiana, told Live Science.Related Mysteries—Which country has the most islands?

—What’s the tallest wave ever recorded on Earth?

—What’s the oldest mountain range in the world? (How about the youngest?)

Olympus Mons could get so tall because Mars lacks plate tectonics, the large rafts of crust that dominate Earth’s geological processes. Olympus Mons formed over a hotspot — a deep well of rising magma — that repeatedly erupted. Just like the Hawaiian Islands, that erupted lava would flow down the sides of the mountain and cool into a new layer of rock.

However, even though the Hawaiian Islands also formed over a hotspot, the Pacific plate keeps moving, so the islands won’t stay over the hotspot long enough for their volcanoes to become as large as a mountain like Olympus Mons.

“On Mars if you just have that same hotspot but the plate isn’t moving, you can make enormous, enormous volcanoes over the course of hundreds of millions or billions of years of activity,” Horgan said.

But even giants like Olympus Mons have a limit. According to Horgan, if the volcano is still active (so far, we haven’t observed any current activity), it’s likely nearing the end of its growth. This is because the pressure required to continue to pump magma to the top of the mountain might soon be unable to overcome the forces working against it — the height of the mountain and Mars’ own gravitational pull. 

“You can think of a volcano basically as a pipe that you’re trying to pump lava through, and on some level, if it’s too big, too high, you don’t have enough power to get the lava through,” Horgan said.

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China’s nationwide ‘cash for clunkers’ trade-in program causing huge e-bike boom

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China's nationwide 'cash for clunkers' trade-in program causing huge e-bike boom

While much of the Western world is still figuring out how to get more people on electric bikes, China just flipped a switch, and the results are staggering. Thanks to a generous nationwide trade-in program rolled out around six months ago, China has seen an explosive surge in electric bicycle sales, with over 8.47 million new e-bikes hitting the road in the first half of 2025 alone.

The program, which offers subsidies to riders who trade in their old, often outdated electric bikes for newer, safer, and more efficient models, has sparked a new e-bike sale boom in a country already dominated by e-bike travel. In major provinces like Jiangsu, Hebei, and Zhejiang, over one million new e-bikes were sold in each region in just six months. That’s a tidal wave of e-bike sales.

The incentives vary depending on location and the model being traded in, but for many consumers, the subsidies cover a substantial portion of a new e-bike’s price – enough to turn a “maybe next year” purchase into a “right now” upgrade. And these aren’t just budget bikes either. The program has driven demand for higher-quality models with better batteries, safer braking systems, and more reliable electronics, accelerating both adoption and innovation across the industry.

The move has proven successful in replacing the millions of older models with lower-quality lithium-ion batteries that had posed safety risks around the country. Instead, China has pushed for higher-quality lithium-ion batteries, a return to a newer generation of higher-performance AGM batteries, and even interesting new sodium-ion battery options.

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Most e-bikes in China look more like what we’d consider seated scooters

According to China’s Ministry of Commerce, more than 8.4 million consumers have participated in the e-bike trade-in program so far, contributing to a sales increase of 643.5% year-over-year and more than doubling sales month-over-month. Meanwhile, production of new electric bicycles rose by nearly 28%, as manufacturers scrambled to meet demand. The sales boosts have already been seen in the financial reports of major industry players like NIU.

And it’s not just the big players benefiting – over 82,000 small independent e-bike dealers reported average sales increases of ¥302,000 (around US $42,000), giving a serious boost to local economies.

What’s particularly striking here is how fast this happened. The program was officially launched late last year as part of a broader effort to stimulate domestic consumption and phase out outdated vehicles and appliances. But while most analysts expected gradual growth, the e-bike sector responded much more quickly. In less than a year, the trade-in subsidies have reshaped the electric bicycle market, creating a consumer-driven boom that shows no signs of slowing.

For those of us watching from outside China, it’s hard not to wonder what might happen if other countries tried something similar. While most families in Chinese cities already own an electric bike and thus see this as an opportunity to trade it in for a newer model, Western countries like the US are still figuring out how to stimulate commuters into buying their first e-bike.

It’s too soon to know exactly how long the boom will last or whether the momentum will carry into 2026 and beyond. We’ve seen bicycle industry bubbles grow and burst before. But one thing’s clear: with the right incentives, even modest ones, it’s possible to ignite real, large-scale change. China just proved it with nearly 8.5 million new e-bikes to show for it.

And if you’re wondering what it looks like when a country takes electric micromobility seriously, this is it.

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I’ve followed the PM wherever he goes in his first year in office – here’s what I’ve observed

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I've followed the PM wherever he goes in his first year in office - here's what I've observed

July 5 2024, 1pm: I remember the moment so clearly.

Keir Starmer stepped out of his sleek black car, grasped the hand of his wife Vic, dressed in Labour red, and walked towards a jubilant crowd of Labour staffers, activists and MPs waving union jacks and cheering a Labour prime minister into Downing Street for the first time in 14 years.

Starmer and his wife took an age to get to the big black door, as they embraced those who had helped them win this election – their children hidden in the crowd to watch their dad walk into Number 10.

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Keir Starmer, not the easiest public speaker, came to the podium and told the millions watching this moment the “country has voted decisively for change, for national renewal”.

He spoke about the “weariness at the heart of the nation” and “the lack of trust” in our politicians as a “wound” that “can only be healed by actions not words”. He added: “This will take a while but the work of change begins immediately.”

A loveless landslide

That was a day in which this prime minister made history. His was a victory on a scale that comes around but one every few decades.

He won the largest majority in a quarter of a century and with it a massive opportunity to become one of the most consequential prime ministers of modern Britain – alongside the likes of Margaret Thatcher or Tony Blair.

But within the win was a real challenge too.

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Starmer’s was a loveless landslide, won on a lower share of the vote than Blair in all of his three victories and 6 percentage points lower than the 40% Jeremy Corbyn secured in the 2017 general election.

It was the lowest vote share than any party forming a post-war majority government. Support for Labour was as shallow as it was wide.

In many ways then, it was a landslide built on shaky foundations: low public support, deep mistrust of politicians, unhappiness with the state of public services, squeezed living standards and public finances in a fragile state after the huge cost of the pandemic and persistent anaemic growth.

Put another way, the fundamentals of this Labour government, whatever Keir Starmer did, or didn’t do, were terrible. Blair came in on a new dawn. This Labour government, in many ways, inherited the scorched earth.

The one flash of anger I’ve seen

For the past year, I have followed Keir Starmer around wherever he goes. We have been to New York, Washington (twice), Germany (twice), Brazil, Samoa, Canada, Ukraine, the Netherlands and Brussels. I can’t even reel off the places we’ve been to around the UK – but suffice to say we’ve gone to all the nations and regions.

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Starmer pushed on scale of “landslide” election win

What I have witnessed in the past year is a prime minister who works relentlessly hard. When we flew for 27 hours non-stop to Samoa last autumn to the Commonwealth Heads of Government Meeting (CHOGM) summit, every time I looked up at the plane, I saw a solitary PM, his headlight shining on his hair, working away as the rest of us slept or watched films.

He also seems almost entirely unflappable. He rarely expresses emotion. The only time I have seen a flash of anger was when I questioned him about accepting freebies in a conversation that ended up involving his family, and when Elon Musk attacked Jess Phillips.

I have also witnessed him being buffeted by events in a way that he would not have foreseen. The arrival of Donald Trump into the White House has sucked the prime minister into a whirlwind of foreign crises that has distracted him from domestic events.

When he said over the weekend, as a way of explanation not an excuse, that he had been caught up in other matters and taken his eye off the ball when it came to the difficulties of welfare reform, much of Westminster scoffed, but I didn’t.

I had followed him around in the weeks leading up to that vote. We went from the G7 in Canada, to the Iran-Israel 12-day war, to the NATO summit in the Hague, as the prime minister dealt with, in turn, the grooming gangs inquiry decision, the US-UK trade deal, Donald Trump, de-escalation in the Middle East and a tricky G7 summit, the assisted dying vote, the Iran-Israel missile crisis.

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In September 2024, the PM defended taking £20k GCSE donation

He was taking so many phone calls on Sunday morning from Chequers, that he couldn’t get back to London for COBRA [national emergency meeting] because he couldn’t afford to not have a secure phone line for the hour-long drive back to Downing Street.

He travelled to NATO, launched the National Security Review and agreed to the defence alliance’s commitment to spend 5% of GDP on defence by 2035. So when he came back from the Hague into a full-blown welfare rebellion, I did have some sympathy for him – he simply hadn’t had the bandwidth to deal with the rebellion as it began to really gather steam.

Dealing with rebellion

Where I have less sympathy with the prime minister and his wider team is how they let it get to that point in the first place.

Keir Starmer wasn’t able to manage the latter stages of the rebellion, but the decisions made months earlier set it up in all its glory, while Downing Street’s refusal to heed the concerns of MPs gave it momentum to spiral into a full-blown crisis.

The whips gave warning after 120 MPs signed a letter complaining about the measures, the Work and Pensions Secretary Liz Kendall had done the same, but Starmer and Reeves were, in the words of one minister, “absolutist”.

“They assumed people complaining about stuff do it because they are weak, rather than because they are strong,” said the minister, who added that following the climbdown, figures in Number 10 “just seemed completely without knowledge of the gravity of it”.

That he marks his first anniversary with the humiliation of having to abandon his flagship welfare reforms or face defeat in the Commons – something that should be unfathomable in the first year of power with a majority that size – is disappointing.

To have got it that wrong, that quickly with your parliamentary party, is a clear blow to his authority and is potentially more chronic. I am not sure yet how he recovers.

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Welfare vote ‘a blow to the prime minister’

Keir Starmer said he wanted to rule country first, party second, but finds himself pinned by a party refusing to accept his centrist approach. Now, ministers tell MPs that there will be a financial consequence of the government’s decision to delay tightening the rules on claiming disability benefits beyond the end of 2026.

A shattered Rachel Reeves now has to find the £5bn she’d hoped to save another way. She will defend her fiscal rules, which leaves her the invidious choice of tax rises or spending cuts. Sit back and watch for the growing chorus of MPs that will argue Starmer needs to raise more taxes and pivot to the left.

That borrowing costs of UK debt spiked on Wednesday amid speculation that the chancellor might resign or be sacked, is a stark reminder that Rachel Reeves, who might be unpopular with MPs, is the markets’ last line of defence against spending-hungry Labour MPs. The party might not like her fiscal rules, but the markets do.

What’s on the horizon for year two?

The past week has set the tone now for the prime minister’s second year in office. Those around him admit that the parliamentary party is going to be harder to govern. For all talk of hard choices, they have forced the PM to back down from what were cast as essential welfare cuts and will probably calculate that they can move him again if they apply enough pressure.

There is also the financial fall-out, with recent days setting the scene for what is now shaping up to be another definitive budget for a chancellor who now has to fill a multi-billion black hole in the public finances.

But I would argue that the prime minister has misjudged the tone as he marks that first year. Faced with a clear crisis and blow to his leadership, instead of tackling that head on the prime minister sought to ignore it and try to plough on, embarking on his long-planned launch of the 10-year NHS plan to mark his year in office, as if the chancellor’s tears and massive Labour rebellions over the past 48 hours were mere trifles.

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Why was the chancellor crying at PMQs?

It was inevitable that this NHS launch would be overshadowed by the self-inflicted shambles over welfare and the chancellor’s distress, given this was the first public appearance of both of them since it had all blown up.

But when I asked the prime minister to explain how it had gone so wrong on welfare and how he intended to rebuild your trust and authority in your party, he completely ignored my question. Instead, he launched into a long list of Labour’s achievements in his first year: 4 million extra NHS appointments; free school meals to half a million more children; more free childcare; the biggest upgrade in employment rights for a generation; and the US, EU and India free trade deals.

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Starmer defends reaction to Reeves crying in PMQs

I can understand the point he was making and his frustration that his achievements are being lost in the maelstrom of the political drama. But equally, this is politics, and he is the prime minister. This is his story to tell, and blowing up your welfare reform on the anniversary week of your government is not the way to do it.

Is Starmer failing to articulate his mission?

For Starmer himself, he will do what I have seen him do before when he’s been on the ropes, dig in, learn from the errors and try to come back stronger. I have heard him in recent days talk about how he has always been underestimated and then proved he can do it – he is approaching this first term with the same grit.

If you ask his team, they will tell you that the prime minister and this government is still suffering from the unending pessimism that has pervaded our national consciousness; the sense politics doesn’t work for working people and the government is not on their side.

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Fiscal rules are silly but important

Starmer knows what he needs to do: restore the social contract, so if you work hard you should get on in life. The spending review and its massive capital investment, the industrial strategy and strategic defence review – three pieces of work dedicated to investment and job creation – are all geared to trying to rebuild the country and give people a brighter future.

But equally, government has been, admit insiders, harder than they thought as they grapple with multiple crises facing the country – be that public services, prisons, welfare.

It has also lacked direction. Sir Keir would do well to focus on following his Northern Star. I think he has one – to give working people a better life and ordinary people the chance to fulfil their potential.

But somehow, the prime minister is failing to articulate his mission, and he knows that. When I asked him at the G7 summit in Canada what his biggest mistake of the first year was, he told me: “We haven’t always told our story as well as we should.”

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Beth Rigby asks the PM to reflect on a year in office

I go back to the Keir Starmer of July 5 2024. He came in on a landslide, he promised to change the country, he spoke of the lack of trust and the need to prove to the public that the government could make their lives better through actions not words.

In this second year, he is betting that the legislation he has passed and strategies he has launched will drive that process of change, and in doing so, build back belief.

But it is equally true that his task has become harder these past few weeks. He has spilled so much blood over welfare for so little gain, his first task is to reset the operation to better manage the party and rebuild support.

But bigger than that, he needs to find a way to not just tell his government’s story but sell his government’s story. He has four years left.

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Politics

Did Keir Starmer screw up his own anniversary?

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Did Keir Starmer screw up his own anniversary?

👉 Click here to listen to Electoral Dysfunction on your podcast app 👈

Sir Keir Starmer wanted to be talking about what he sees as Labour’s achievements after 12 months in government and his 10-year plan for the NHS.

But, after another dramatic policy U-turn and the sight of his own chancellor crying at PMQs, when he kept his support for her slightly vague, Beth Rigby, Harriet Harman and Ruth Davidson discuss if his start in office has been shattered by this week.

They also wonder if the solution to make relations with his own MPs a bit easier would be to make better use of Angela Rayner.

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