Canada is a warning: more and more of the world will soon be too hot for humans

Canada is a warning: more and more of the world will soon be too hot for humans  https://www.theguardian.com/commentisfree/2021/jun/30/canada-temperatures-limits-human-climate-emergency-earth# Simon Lewis How did a small town in Canada become one of the hottest places on Earth?

 Without an immediate global effort to combat the climate emergency, the Earth’s uninhabitable areas will keep growing

The climate crisis means that summer is a time of increasingly dangerous heat. This week in the Pacific north-west, temperature records are not just being broken, they are being obliterated. Temperatures reached a shocking 47.9C in British Columbia, Canada. Amid temperatures more typically found in the Sahara desert, dozens have died of heat stress, with “roads buckling and power cables melting”.

Another heatwave earlier in June saw five Middle East countries top 50°C. The extreme heat reached Pakistan, where 20 children in one class were reported to have fallen unconscious and needed hospital treatment for heat stress. Thankfully, they all survived.

Additional warming from greenhouse gas emissions means that such extreme heatwaves are more likely and scientists can now calculate the increase in their probability. For example, the 2019 European heatwave that killed 2,500 people was five times more likely than it would have been without global warming.

In most places, extreme heatwaves outside the usual range for a region will cause problems, from disrupting the economy to widespread mortality, particularly among the young and old. Yet in places in the Middle East and Asia something truly terrifying is emerging: the creation of unliveable heat.

While humans can survive temperatures of well over 50C when humidity is low, when both temperatures and humidity are high, neither sweating nor soaking ourselves can cool us. What matters is the “wet-bulb” temperature – given by a thermometer covered in a wet cloth – which shows the temperature at which evaporative cooling from sweat or water occurs. Humans cannot survive prolonged exposure to a wet-bulb temperature beyond 35C because there is no way to cool our bodies. Not even in the shade, and not even with unlimited water.

In most places, extreme heatwaves outside the usual range for a region will cause problems, from disrupting the economy to widespread mortality, particularly among the young and old. Yet in places in the Middle East and Asia something truly terrifying is emerging: the creation of unliveable heat.

While humans can survive temperatures of well over 50C when humidity is low, when both temperatures and humidity are high, neither sweating nor soaking ourselves can cool us. What matters is the “wet-bulb” temperature – given by a thermometer covered in a wet cloth – which shows the temperature at which evaporative cooling from sweat or water occurs. Humans cannot survive prolonged exposure to a wet-bulb temperature beyond 35C because there is no way to cool our bodies. Not even in the shade, and not even with unlimited water.

Second, prepare for the inevitable heatwaves of the future. Emergency public health planning is the initial priority: getting essential information to people and moving vulnerable people into air-conditioned locations. Heatwave forecasts should include wet-bulb temperatures so that people can learn to understand the dangers.

Plans should account for the fact that heatwaves intensify structural inequalities. Poorer neighbourhoods typically have fewer green spaces and so heat up more, while outdoor workers, often poorly paid, are especially vulnerable. The rich also buy up cooling equipment at high prices once a heatwave is underway and have many more options to flee, underscoring the importance of public health planning.

Beyond crisis management, governments need to invest in making countries function in the new climate we are creating, including the extremes. In climate policy terms this is known as “adaptation”.

Of paramount importance is energy supplies being resilient to heatwaves, as people will be relying on electricity for cooling from air-conditioning units, fans and freezers, which are all life-savers in a heatwave. Similarly, internet communications and data centres need to be future-proofed, as these are essential services that can struggle in the heat.

Beyond this, new regulations are needed to allow buildings to keep cool and for transport systems, from roads to trains, to be able to operate under much higher temperature extremes.

Many of these changes can meet other challenges. Retro-fitting homes to be energy-efficient is also the perfect opportunity to modify them to also keep us cool. For example, installing electric heat pumps to warm houses in the winter means that in the summer they can also be switched to run in reverse to work as a cooling system. Cities can be kept cooler with green roofs and more green spaces, which also make them better places to live.

The final task is future-proofing agriculture and the wider ecosystems we all ultimately rely on. Heat can cause havoc with crop production. In Bangladesh, just two days of hot air in April this year destroyed 68,000 hectares of rice, affecting over 300,000 farmers with losses of US$39m (£28m). New heat-tolerant varieties of crops need developing and deploying. The alternative is higher food costs and food price spikes with the increased poverty and civil unrest that typically accompanies them.

Given these immense challenges how are governments doing on climate adaptation? Very poorly. The Paris agreement on climate change obliged countries to submit their adaptation plans, but only 13 countries have done so. One of those is the UK, but government plans were judged by its own independent advisors to have “failed to keep pace with the worsening reality of climate risk”.

The Glasgow Cop26 climate talks will need to put the spotlight on adaptation planning and funding for vulnerable countries. To curtail the impacts of ever more ferocious heatwaves, reducing emissions will need to go hand in hand with adapting to the swelteringly hot world we are creating. Stabilising the climate by 2050 is well within the timeframe of one working lifetime, as is adapting to allow us all to prosper in this new world. There is no time to lose.

• Simon Lewis is professor of global change science at University College London and University of Leeds

July 1, 2021 Posted by Christina Macpherson | 2 WORLD, climate change | Leave a comment

Rising sea levels might mean the end for many nuclear power stations.

Perspective: Will Rising Seas Be Nuclear’s Achilles’ Heel? https://www.energyintel.com/pages/eig_article.aspx?DocId=1109371&NLID=104 27 June21,

Nuclear energy’s unique selling proposition (USP) of lower-carbon electricity production sits in the context of a much larger picture — that coastal nuclear will be one of the first, and most significant, casualties to ramping climate impact, argues Paul Dorfman, of the UCL Energy Institute, University College London. Because of this, Dorfman, who authored a report on the issue released this week, posits that nuclear, far from helping with our shared climate problem, may well add to it.

As the world heats, sea levels are rising at an accelerated rate — now estimated at 3 to 4 millimeters a year — as ice stored at the poles and in glaciers melts. A recent NASA study based on 25 years of satellite data found that the Arctic is melting so rapidly that it’s now 20% thinner than a decade ago, weakening a major source of the planet’s cooling.

The polar ice caps are melting six times faster than they were in the 1990s, with the high melt rate corresponding to the worst-case scenario for global heating set out by the Intergovernmental Panel on Climate Change. This means that the planet will see a very significant rise in sea level, resulting in ramping annual coastal and inland flooding.

The melting Arctic ice cap is currently the biggest single contributor to sea-level rise, and already imperils coasts and coastal populations. In other words, a significant part of the Greenland Ice Sheet — which lost a record amount of ice in 2019 — is on the brink of a tipping point, after which accelerated melting would become inevitable.

And the Antarctic (where more than half of Earth’s freshwater resources are held, representing by far the largest potential source for global sea-level rise under future warming conditions) is also threatened — with the likelihood that its long-term sea-level contribution will dramatically exceed that of other sources. Put simply, current fundamental scientific knowledge of climate sensitivity and polar ice melt concludes that sea-level rise is significantly faster than previously believed and likely to exceed up to 2.5 meters well within the 21st century.

And the Antarctic (where more than half of Earth’s freshwater resources are held, representing by far the largest potential source for global sea-level rise under future warming conditions) is also threatened — with the likelihood that its long-term sea-level contribution will dramatically exceed that of other sources. Put simply, current fundamental scientific knowledge of climate sensitivity and polar ice melt concludes that sea-level rise is significantly faster than previously believed and likely to exceed up to 2.5 meters well within the 21st century.

Unfortunately for coastal infrastructure, the effect of rising mean sea levels will be felt most profoundly during extreme storm conditions as strong winds and low atmospheric pressure bring about a temporary and localized increase in sea level known as a “storm surge.”

Recent published peer-reviewed scientific data point to much quicker and greater sea-level rise, faster, harder, more destructive storms, storm surges, and inland flooding. Yet the overwhelming majority of installed nuclear capacity began operation well before global heating was considered in design or construction.

Given ramping predictions for sea-level rise and climatic disturbance, nuclear will prove an important risk. This is because 41% of all nuclear power plants worldwide operate on the sea coast, making them vulnerable to increasing sea-level rise, storm intensity and storm surge-induced flooding. Inland nuclear installations may fare no better, as they face increasingly severe wildfire, with episodic flooding alternating with low river flow and raised water temperatures — the latter significantly impacting reactor cooling capacity and, hence, viability.

Since climate change will impact nuclear plant earlier and harder than industry, government or regulatory bodies may expect, necessary mitigation efforts imply significantly increased expense for nuclear construction, operation and decommissioning. Spent fuel management facilities will also be increasingly vulnerable to unanticipated climate-driven environmental events, involving significant risk to onsite high-, medium- and low-level nuclear waste stockpiles.

A key associated problem is that 516 million people worldwide live within a 50 mile (80 kilometer) radius of at least one operating nuclear power plant, and 20 million live within a 10 mile (16 km) radius — and so face health and safety risks from climate change-induced radiation contamination release events. Since at least 100 nuclear power stations are just a few meters above sea level and will be increasingly threatened by serious flooding caused by accelerating sea-level rise and more frequent storm surge, there’s no question that nuclear stations are, quite literally, on the front line of climate change risk — and not in a good way.

A key associated problem is that 516 million people worldwide live within a 50 mile (80 kilometer) radius of at least one operating nuclear power plant, and 20 million live within a 10 mile (16 km) radius — and so face health and safety risks from climate change-induced radiation contamination release events. Since at least 100 nuclear power stations are just a few meters above sea level and will be increasingly threatened by serious flooding caused by accelerating sea-level rise and more frequent storm surge, there’s no question that nuclear stations are, quite literally, on the front line of climate change risk — and not in a good way.

For example, the US Nuclear Regulatory Commission concludes that the vast majority of US nuclear sites have already experienced flooding hazard beyond their design basis, and a recent US Army War College report states that nuclear power facilities are at “high risk” of temporary or permanent closure due to climate threats — with 60% of US nuclear capacity vulnerable to major risks including sea-level rise, severe storms, and cooling water shortages.

Recent climate impact data suggests the need for a substantive reassessment of nuclear’s role in net zero. In other words, nuclear’s lower-carbon electricity USP sits alongside the probability that coastal nuclear plants will be one of the first, and most significant, casualties of rising seas; with inland nuclear plants increasingly subject to intermittent flooding, loss of reactor cooling, and wildfire risk.

This unfortunate reality means that evolutionary modeled predictions of climate change impact on nuclear infrastructure must be accounted for, including the potential for rapidly changing extreme events, abrupt interactions and problematic feedbacks. Further comprehensive nuclear industry and regulatory risk assessments based on “all case” scenarios must be published and regularly updated as fundamental scientific climate impact evidence evolves. Such an approach must include costings for any necessary mitigation measures and a range of contingency plans for the swift onset of climate-driven severe weather.

June 28, 2021 Posted by Christina Macpherson | 2 WORLD, climate change | 1 Comment

Nuclear power is in the front line of climate change – and NOT in a good way

In the last year, climate models have run hot. As knowledge of enhanced climate sensitivity and polar ice melt-rate evolves, it has become clear that sea-level rise is significantly faster than previously thought, resulting in more frequent and destructive storm, storm surge, severe precipitation, and flooding.

 With rare extreme events today becoming the norm in the future, existing risk mitigation measures become increasingly obsolete. The corollary to this analysis is that present and planned UK coastal nuclear installations will be at significant risk.

In other words, nuclear’s lower-carbon electricity USP sits in the context of the much larger picture – that UK coastal nuclear will be one of the first, and most significant, casualties to ramping climate impact. Put simply, UK nuclear is quite literally on the front-line of climate change – and not in a good way.

 Nuclear Consultation Group 24th June 2021

June 26, 2021 Posted by Christina Macpherson | 2 WORLD, climate change | Leave a comment

Earth is now trapping an ‘unprecedented’ amount of heat, NASA says

Climate and Environment New research shows that the amount of heat the planet traps has roughly doubled since 2005, contributing to more rapidly warming oceans, air and land The International Space Station orbits over the Atlantic Ocean southwest of South Africa. (NASA) By  Tik Root June 16, 2021 at 3:00 p.m. CDT 893 The amount […]

Earth is now trapping an ‘unprecedented’ amount of heat, NASA says — limitless life

June 19, 2021 Posted by Christina Macpherson | 2 WORLD, climate change | Leave a comment

We don’t need nuclear power to tackle climate change .

(I had great difficulty trying to get this excellent article. Below are just a few extracts from it – C.M. )

I’ve always kept an open mind about nuclear power, but after four decades working on this issue, I’m still waiting for someone to prove me wrong. Jonathon Porritt, Greenpeace, 1 June 2021

I’ve been ‘anti-nuclear’ since 1974, and my basic position hasn’t changed much during that time. Not because I decided back then that nuclear power was an inherently ‘wicked’ technology that must be avoided at all costs. I’ve simply concluded that it’s the wrong technology at the wrong time for sorting out all the challenges that we face. I can genuinely claim that I’ve been waiting more than 45 years for someone to prove me wrong.

……..  the alternatives to nuclear power have performed better than almost anyone expected.

……. there is no longer any doubt about the viability of the renewables alternative. In 2020, Stanford University issued a collection of 56 peer-reviewed journal articles, from 18 independent research groups, supporting the idea that all the energy required for electricity, transport, heating and cooling, and all industrial purposes, can be supplied reliably with 100% (or near 100%) renewable energy. The solutions involve transitioning ASAP to 100% renewable wind – water – solar (WWS), energy efficiency and energy storage

The transition is already happening. To date, 11 countries have reached or exceeded 100% renewable electricity. And a further 12 countries are intent on reaching that threshold by 2030. In the UK, the Association for Renewable Energy and Clean Technology says we can reach 100% renewable electricity by 2032. Last year, we crossed the 40% threshold.“The only impediment to change is political. At the current 15% to 20% growth rates for solar and wind, fossil fuels will be pushed out of the electricity sector by the mid-2030s, and out of total energy supply by 2050. Poor countries will be greatest beneficiaries. They have the largest ratio of solar and wind potential to energy demand, and stand to unlock huge domestic benefits.”

Nuclear plays no part in any of these projections, whether we’re talking big reactors or small reactors, fission or fusion. The simple truth is this: we should see nuclear as another 20th century technology, with an ever-diminishing role through into the 21st century.

The work of Andy Stirling and Phil Johnston at Sussex University has shown the strength of these connections, demonstrating how the UK’s military industrial base would become unaffordable in the absence of a nuclear energy programme.

June 10, 2021 Posted by Christina Macpherson | 2 WORLD, climate change | Leave a comment

Nuclear energy – The solution to climate change?

Nuclear energy – The solution to climate change?

Science Direct, NikolausMuellnerNikolausArnoldKlausGuflerWolfgangKrompWolfgangRennebergWolfgangLiebertI Institute of Safety- and Risk Sciences, University of Natural Resources and Life Sciences, Vienna, Austria

Received 24 August 2020, Revised 7 April 2021, Accepted 4 May 2021, Available online 16 May 2021. 

Abstract

With increased awareness of climate change in recent years nuclear energy has received renewed attention. Positions that attribute nuclear energy an important role in climate change mitigation emerge.

We estimate an upper bound of the CO2 saving potential of various nuclear energy growth scenarios, starting from our projection of nuclear generating capacity based on current national energy plans to scenarios that introduce nuclear energy as substantial instrument for climate protection. We then look at needed uranium resources.

The most important result of the present work is that the contribution of nuclear power to mitigate climate change is, and will be, very limited. At present nuclear power avoids annually 2–3% of total global GHG emissions. Looking at announced plans for new nuclear builds and lifetime extensions this value would decrease even further until 2040. Furthermore, a substantial expansion of nuclear power will not be possible because of technical obstacles and limited resources. Limited uranium-235 supply inhibits substantial expansion scenarios with the current nuclear technology. New nuclear technologies, making use of uranium-238, will not be available in time. Even if such expansion scenarios were possible, their climate change mitigation potential would not be sufficient as single action.

1. Introduction……………

1.2. CO2 emissions from nuclear power plants

The direct CO2 emissions from nuclear power plants during operation are low. However, looking at indirect emissions as well and considering the whole life cycle of nuclear power (uranium mining, milling, conversion, enrichment, fuel fabrication, construction and dismantling of the nuclear power plant, spent fuel processing and storage), nuclear power is certainly not emission-free…………..

6. Conclusions and policy implications

Anthropogenic climate change requires a rapid shift towards a CO2 neutral economy, if the global average temperature increase is to be kept below 2∘C, or, preferably, below 1.5∘C compared to pre-industrial levels. By 2050 the economy should be CO2 neutral, therefore climate change mitigation measures are needed in the near term to medium term future. Such a shift would strongly influence the energy (and electricity) supply system, which is currently based to a larger part on fossil fuels.

The most important result of the present work is that the contribution of nuclear power to mitigate climate change is, and will be, very limited.   According to current planning nuclear power would avoid at most4 annually 2–3% of total global GHG emissions in the years 2020–2040. Moreover, nuclear power cannot be expanded to be the main source of future electricity generation. Expansion scenarios require an increase in uranium mining, which is met by two limitations: uranium production could hardly keep up during the expansion phase, and the overall amount of available uranium is limited. Such scenarios would leave new nuclear power plants without fuel during their planned life time. Fast breeder reactors promise a solution to the problem of limited uranium-235 resources, but will not be available for commercial deployment before 2040–2050. And given the considerable research effort and research times up to now, it is even doubtful if a commercially deployable fast breeder reactor will be available then. But even assuming such a scenario were feasile, even % of projected global GHG emissions from other sectors in 2040 and would still require drastic actions to reduce all emissions to zero. However, current nuclear reactors, no matter how safe they may be, always carry a residual risk for severe, catastrophic accidents (Sehgal, 2012) and large releases of radioactive materials (Seibert et al., 2012). New reactors attempt to reduce the residual risk, but even with the future technologies currently envisaged a nuclear catastrophe cannot be fully excluded. The main contribution to current nuclear electricity generation stems from reactors built 1970–1990, which were designed 1960–1980. New reactor technologies promise that the risk for severe accidents is reduced by a factor of ten. However, according to current plans, the major part of future nuclear generating capacity stems from lifetime extensions of existing plants and only a limited part will come from new builds (in 2040 ~30% new builds, ~70% current operating reactors life time extended and/or in long term operation according to ISR-projection).

Given the modest contribution of nuclear power to climate change mitigation another option is feasible, which is the phase-out of nuclear power. This finding is in agreement with substantial evidence of a comprehensive global energy study of the International Institute of Applied System Analysis (IIASA, 2012). In this study a normative approach was adopted, a scenario that by 2050 society is on a climate pathway to fulfilling the 2∘C target while still providing access to modern energy services to all humans. Starting from the goal of a sustainable, CO2 neutral economy, IIASA (2012) calculates back and investigates which energy pathways lead to such a future. One of the important results of the analysis shows that none of the evaluated boundary conditions make it necessary to use nuclear power. Even high energy demand assumptions without substantial change in the transport system allow other energy sources to substitute nuclear energy.

The current contribution of nuclear energy to climate change mitigation is small and, according to current planning, will stay at this level in the near-to mid term future. Nuclear expansion strategies are not feasible due to resource limitations. New nuclear technologies without those limitations will not be ready in the critical time frame 2020 to 2050 due to the long research, licensing, planning and construction times of the nuclear industry. Current plans would keep the nuclear capacity roughly at its current level mainly by life time extensions of existing reactors. But given the limited contribution to climate mitigation, complete phase out is a feasible option as well. Society must decide, given the drawbacks of the use of nuclear energy (risk of catastrophic accidents, proliferation, radioactive waste), whether the nuclear option should be pursued, or whether other climate change mitigation technologies should substitute the nuclear contribution……..https://www.sciencedirect.com/science/article/pii/S0301421521002330?via%3Dihub

June 10, 2021 Posted by Christina Macpherson | 2 WORLD, climate change | Leave a comment

Nuclear industry survives on its false claim that it helps the fight against climate change

April 28th, 2021, by Paul Brown,   The nuclear industry’s unfounded claims let it rely on “dark arts”, ignoring much better ways to cut carbon emissions.

Nuclear industry’s unfounded claims let it survive,   https://climatenewsnetwork.net/nuclear-industrys-unfounded-claims-let-it-survive/

– It is the global nuclear industry’s unfounded claims – not least that it is part of the solution to climate change because it is a low-carbon source of electricity – that allow it to survive, says a devastating demolition job by one of the world’s leading environmental experts, Jonathan Porritt.

In a report, Net Zero Without Nuclear, he says the industry is in fact hindering the fight against climate change. Its claim that new types of reactor are part of the solution is, he says, like its previous promises, over-hyped and illusionary.

Porritt, a former director of Friends of the Earth UK, who was appointed chairman of the UK government’s Sustainable Development Commission after years of campaigning on green issues, has written the report in a personal capacity, but it is endorsed by an impressive group of academics and environmental campaigners.

His analysis is timely, because the nuclear industry is currently sinking billions of dollars into supporting environmental think tanks and energy “experts” who bombard politicians and news outlets with pro-nuclear propaganda.

Porritt provides a figure of 46 front groups in 18 countries practising these “dark arts”, and says it is only this “army of lobbyists and PR specialists” that is keeping the industry alive.

First he discusses the so-called levelized cost of energy (LCOE), a measure of the average net present cost of electricity generation for a generating plant over its lifetime.

“The case against nuclear power is stronger than it has ever been before”

n 2020, the LCOE of producing one megawatt of electricity in the UK showed huge variations:

• large scale solar came out cheapest at £27 (US$38)
• onshore wind was £30
• the cheapest gas: £44
• offshore wind: £63
• coal was £83
• nuclear – a massive £121 ($168).

Porritt argues that even if you dispute some of the methods of reaching these figures, it is important to look at trends. Over time wind and solar are constantly getting cheaper, while nuclear costs on the other hand are rising – by 26% in ten years.

His second issue is the time it takes to build a nuclear station. He concludes that the pace of building them is so slow that if western countries started building new ones now, the amount of carbon dioxide produced in manufacturing the concrete and steel needed to complete them would far outweigh any contribution the stations might make by 2050 to low carbon electricity production. New build nuclear power stations would in fact make existing net zero targets harder to reach.

“It is very misleading to make out that renewables and nuclear are equivalently low-carbon – and even more misleading to describe nuclear as zero-carbon, as a regrettably significant number of politicians and industry representatives continue to do – many of them in the full knowledge that they are lying”, he writes.

He says that the British government and all the main opposition political parties in England and Wales are pro-nuclear, effectively stifling public debate, and that the government neglects the most important way of reducing carbon emissions: energy efficiency.

Also, with the UK particularly well-endowed with wind, solar and tidal resources, it would be far quicker and cheaper to reach 100% renewable energy without harbouring any new nuclear ambitions.

The report discusses as well issues the industry would rather not examine – the unresolved problem of nuclear waste, and the immense time it takes to decommission nuclear stations. This leads on to the issue of safety, not just the difficult question of potential terrorist and cyber attacks, but also the dangers of sea level rise and other effects of climate change.

Failed expectations

These include the possibility of sea water, particularly in the Middle East, becoming too warm to cool the reactors and so rendering them difficult to operate, and rivers running low during droughts, for example in France and the US, forcing the stations to close when power is most needed.

Porritt insists he has kept an open mind on nuclear power since the 1970s and still does so, but that they have never lived up to their promises. He makes the point that he does not want existing nuclear stations to close early if they are safe, since they are producing low carbon electricity. However, he is baffled by the continuing enthusiasm among politicians for nuclear power: “The case against nuclear power is stronger than it has ever been before.”

But it is not just the politicians and industry chiefs that come in for criticism. Trade unions which advocate new nuclear power because it is a heavily unionised industry when there are far more jobs in the renewable sector are “especially repugnant.”

He also rehearses the fact that without a healthy civil nuclear industry countries would struggle to afford nuclear weapons, as it is electricity consumers that provide support for the weapons programme.

The newest argument employed by nuclear enthusiasts, the idea that green hydrogen could be produced in large quantities, is one he also debunks. It would simply be too expensive and inefficient, he says, except perhaps for the steel and concrete industries.

Porritt’s report is principally directed at the UK’s nuclear programme, where he says the government very much stands alone in Europe in its “unbridled enthusiasm for new nuclear power stations.”

This is despite the fact that the nuclear case has continued to fade for 15 years. Instead, he argues, British governments should go for what the report concentrates on: Net Zero Without Nuclear. – Climate News Network

May 13, 2021 Posted by Christina Macpherson | 2 WORLD, climate change | 1 Comment

Hypocrisy, climate bullshit, and the push for hydrogen+fossil fuels.

May 8, 2021 Posted by Christina Macpherson | 2 WORLD, climate change | Leave a comment

Faster glacier melting raises hunger threat

Climate News Network 5th May 2021, Glacial retreat − the rate at which mountain ice is turning to running
water − has accelerated. In the last two decades, the world’s 220,000
glaciers have lost ice at the rate of 267 billion tonnes a year on average,
and this faster glacier melting could soon imperil downstream food and
water supplies.

To make sense of this almost unimaginable volume, think of
a country the size of Switzerland. And then submerge it six metres deep in
water. And then go on doing that every year for 20 years.

European scientists report in the journal Nature that, on the basis of satellite
data, they assembled a global snapshot of the entire world’s stock of
land-borne ice, excluding Antarctica and Greenland. And then they began to
measure the impact of global heating driven by profligate fossil fuel use
on the lofty, frozen beauty of the Alps, the Hindu Kush, the Andes, the
Himalayas and the mountains of Alaska.

They found not just loss, but a loss
that was accelerating sharply. Between 2000 and 2004, the glaciers together
surrendered 227 billion tons of ice a year on average. By 2015 to 2019, the
annual loss had risen to 298 billion tonnes. The run-off from the
retreating glaciers alone caused more than one-fifth of observed sea level
rise this century.

May 6, 2021 Posted by Christina Macpherson | 2 WORLD, climate change | Leave a comment