Sustainability – Page 11

Counting on … day 87

16th April 2024

Green cement – part 2

As part of the need to reduce all greenhouse gas emissions to address the climate crisis, reducing emissions from cement production is essential.

50% of the emissions come from the release of carbon dioxide as a byproduct during the clinker making process. One solution is carbon capture- capturing the CO2 before it escapes into the atmosphere, pressurising it to a liquid which is injected into rock strata deep underground. This technology has yet to be developed for use at an industrial scale.

Another solution is to replace the limestone with an alternative that produces less CO2 – such as magnesium oxide mixed with magnesium chloride solution. However such alternative cements may not have all the attributes of cement when in use – different construction methods may be needed.

40% of the emissions are attributable to the energy needed to heat the clinker kilns. Switching to renewable energy to replace coal is one solution but requires considerable investment in green electricity production and distribution.

Using materials other than limestone – such as volcanic rock – that can produce clinker at lower temperatures is another possible solution. Another alternative is to replace a proportion of the cement with an alternative binder such as ground granulated blast furnace slag or pulverised fly ash. Again this may alter the properties of the cement and require different construction methods.

10% of the emissions comes from energy used in mining and transporting the raw materials. Energy efficiency and the use of renewable energy will be a way forward.

Further reading –https://theconversation.com/green-cement-a-step-closer-to-being-a-game-changer-for-construction-emissions-126033

(https://theconstructor.org/concrete/green-cement-types-applications/5568/

Counting on … day 80

5th April 2024

Green Steel

Steel manufacturing produces more CO2 than any other heavy industry, comprising around 8% of total global emissions.

Traditionally steel is made in a blast furnace where the iron ore is he@ted at high temperatures together with coal. As the coal burns it produces carbon monoxide which bonds with and removes oxygen in the iron ore so purifying it to produce metallic iron. The carbon monoxide binding with oxygen becomes carbon dioxide and is one of the main sources of carbon emissions. Other sources of emissions will vary depending how the furnace is heated etc.

The industry is developing various ways of producing steel without – or with reduced – carbon dioxide emissions – known as green steel.

Replacing coal with hydrogen: Green steel can be produced by using hydrogen to remove the oxygen from the the ore – producing water (H2O). Ideally this would be green hydrogen – ie hydrogen produced using renewable energy. This method of producing steel requires heating the furnace to a higher temperature.

Reusing existing steel: steel can easily be recycled in arc furnaces powered by electricity – which ideally would be electricity from renewable energy sources with no carbon dioxide emissions.

Around 30% of the world’s steel is made from recycled steel. However steel cannot be recycled endlessly without loss of quality. Each time it is recycled the proportion of unwanted elements such as copper, nickel and tin increases. On the other hand steel has long in-use life which means that the amount of steel made available for recycling does not at present keep up with the growing demand for more steel. Our modern economies are big users of steel!

(For more detail see https://theconversation.com/green-steel-is-hailed-as-the-next-big-thing-in-australian-industry-heres-what-the-hype-is-all-about-160282)

Which ever form of green steel is produced, the availability of large amounts of renewable energy is going to be critical.

As important will be the way the transition is managed as furnaces are large and highly expensive pieces of kit – ie needing substantial investment – and can take years to install which in some instances has led to workers being laid off – as is proposed at the Tata steel works in Port Talbot. (https://www.theguardian.com/uk-news/2024/mar/25/tata-port-talbot-job-losses-labour-subsidy?CMP=Share_iOSApp_Other).

Other important issues to address are how steel is used – with product design ensuring a long life, whether other materials could be used – timber for example in building construction, and how effectively scrap steel is collected and recycled.

Further reading – https://www.bbc.co.uk/news/business-64538296

Counting on … day 78

3rd April 2024

Biofuels are fuels derived from biomass such as plant material, food waste, algae, or animal waste. There are two forms of biofuel –

“Bioethanol is an alcohol made by fermentation, mostly from carbohydrates produced in sugar or starch crops such as maize, sugarcane, or sweet sorghum. Cellulosic biomass, derived from non-food sources, such as trees and grasses, is also being developed as a feedstock for ethanol production. Ethanol can be used as a fuel for vehicles in its pure form (E100), but it is usually used as a gasoline additive to increase octane ratings and improve vehicle emissions.

And “Biodiesel is produced from oils or fats using transesterification. It can be used as a fuel for vehicles in its pure form (B100), but it is usually used as a diesel additive to reduce levels of particulates, carbon monoxide, and hydrocarbons from diesel-powered vehicles.” (https://en.wikipedia.org/wiki/Biofuel)

Brazil is the largest producer of bioethanol and the EU is the largest producer of biodiesel.

Both forms of biofuel differ from fossil fuels in that they are produced from organic materials being grown now as opposed to using organic materials that were decomposing millions of years ago.

Both produce greenhouse gas emissions but less than do fossil fuels. Biofuels may be made using only waste materials, but often are made from crops that have been specifically grown for this purpose. This may have the affect of diverting land that would otherwise be used for growing food, or may involve deforestation to create new crop lands.

Drax power station which burns timber as a biofuel to generate electricity uses wood pellets. Although wood pellets can be made from waste wood, most of the pellets that are burnt at Drax are made from whole trees that were once growing in virgin forests in South Carolina and British Columbia. These are then imported to the UK. For more information- https://www.bbc.co.uk/news/science-environment-68381160

Counting on … day 75

27th March 2024

Agroforestry offers another approach to farming that enables the long term increased sequestration of carbon dioxide. Agroforestry has two main forms:

“Silvo-pastoral agroforestry: which means the grazing of animals under trees. The animals enrich the soil while the trees provide shelter and fodder for the animals.

Silvo-arable agroforestry: where crops are grown beneath trees, often in rows which are large enough for a tractor to tend to the crops without damaging the trees. This is farming in 3D, the trees and the crops occupy different levels above ground, and also below ground where the tree roots will reach down deeper than the crops.”(1)

The additions of trees in the farm enhances the amount of carbon dioxide that is being . At the same time the practice also benefits the condition of the soil. “Tree roots reach deep into the ground, releasing much-needed carbon into the soil. They cycle nutrients and bind the soil together, preventing it from being eroded by the wind or the rain.”(1)

(1) https://www.soilassociation.org/causes-campaigns/agroforestry/what-is-agroforestry/

Counting on … day 72

22nd March 2024

Carbon sequestration is a formal name given to the processes by which carbon is captured from the atmosphere and stored on a long-term basis. Such long-term storage might include peat bogs, forests, kelp beds etc and may be referred to as ‘carbon sinks’.

Carbon sequestration can be used as a means of mitigating the effects of climate change. This can be biologically by, for example, planting more forests, restoring peat bogs and wetlands, and re-establishing kelp meadows. This natural sequestration can be enhanced, in the case of forests, by using felled timber to make items such as buildings, furniture etc and keeping those items for hundreds of years. However growing trees for timber needs to be carefully managed to a) maximise the carbon captured by the growing tree, and b) to maximise the flourishing of biodiversity.

Carbon can also be sequestered geologically if the CO2 can be captured eg from a cement factory. Then the CO2 “can be compressed to ≈100 bar into a supercritical fluid. In this form, the CO2 could be transported via pipeline … and injected deep underground, typically around 1 km, where it would be stable for hundreds to millions of years.” (https://en.wikipedia.org/wiki/Carbon_sequestration)

Counting on … day 71

21st March 2024

The carbon cycle

The earth’s systems have various ways of absorbing and using carbon dioxide in such a way as to enable life to flourish. Plants absorb carbon dioxide as part of the process of photosynthesis storing the carbon as cellular material in their leaves, branches etc. Plants release carbon dioxide back into the atmosphere as they respire – breathe. A living growing plant absorbs more carbon dioxide than it releases. When the plant dies, the carbon that has been stored as leaves and branches etc slowly decays – breaks down – and the carbon returns to the atmosphere as carbon dioxide. This is as true of water and marine plants as it is true of land plants.

(For a short video describing how trees absorb and use carbon – https://www.woodlandtrust.org.uk/climate-change/carbon-trees/)

Soil in part is made up of dead plant and animal material which decays slowly overtime. Soil is therefore a storer of carbon.

The seas and oceans also contain carbon dioxide that is dissolved in the water. This carbon dioxide cycles through the water as marine plants take in, store and release the carbon as they grow. Marine waters and the layers of sediment at the bottom of the seas and oceans store carbon in the same way as does soil.

This brings us back to an earlier post about how much carbon dioxide there is in the atmosphere (measured in part per million) and the rate at which that concentration is increasing due to human activities – https://greentau.org/2024/02/19/counting-on-day/

Counting on … day 70

20th March 2024

The geological history of oil and gas.

“The formation of oil takes a significant amount of time with oil beginning to form millions of years ago. 70% of oil deposits existing today were formed in the Mesozoic age (252 to 66 million years ago), 20% were formed in the Cenozoic age (65 million years ago), and only 10% were formed in the Paleozoic age (541 to 252 million years ago). This is likely because the Mesozoic age was marked by a tropical climate, with large amounts of plankton in the ocean.

“The formation of oil begins in warm, shallow oceans that were present on the Earth millions of years ago. In these oceans, extremely small dead organic matter – classified as plankton – falls to the floor of the ocean. This plankton consists of animals, called zooplankton, or plants, called phytoplankton. This material then lands on the ocean floor and mixes with inorganic material that enters the ocean by rivers. It is this sediment on the ocean floor that then forms oil over many years”.

The dead plankton, plus algae and bacteria form an organic rich mud.
If the mud remains in an anoxic environment – lacking in oxygen such as stagnant water – it does not decompose and so retains its carbon content.
This anoxic environment becomes embedded by subsequent layers of mud, compressing the carbon rich layer into an organic shale.
Overtime the shale sinks as more layers are added. At a depth of 2 to 4km the temperatures from the earth’s core plus the increased pressure converts the organic shale to oil shale.
If the temperatures at this depth are between 90 and 160C this oil shale is transformed into oil and natural gas. This will either seep upwards being lighter than water, or maybe sealed in by subsequent layers of impervious rock.

(https://energyeducation.ca/encyclopedia/Oil_formation)

Again it is mind blowing to reflect that these oil and gas deposits that took millions of years in the making, are now being burnt at an annual rate of 6.6 billion tonnes, such that we have 47 years of reserves remaining – should we be foolish enough to want to burn them.(https://www.worldometers.info/oil/)

We should keep in mind that the IEA warns that a cannot risk developing and burning new oil and gas reserves without exceeding the 1.5C global warming limit.

Counting on … day 67

15th March 2024

The UK government runs a National Adaptation Programme which assesses the risks arising from climate change and how best we can adapt to reduce of cope with these risks – as well as building on any opportunities where we can gain from change. These plans are reviewed and every five years a new National Adaptation Programme is produced. NAP3 covers the period from 2023 to 2028. It includes items such as:

“protecting the natural environment
supporting business in adapting to climate change
adapting infrastructure (for example, our electricity networks and railways)
protecting buildings and their surroundings (for example, from hotter temperatures)
protecting public health and communities
mitigating international impacts on the UK (for example, on food supplies imported from abroad)”

https://www.gov.uk/government/publications/third-national-adaptation-programme-nap3/understanding-climate-adaptation-and-the-third-national-adaptation-programme-nap3

But are the plans sufficiently stringent?

“Julia King, chair of the adaptation subcommittee of the CCC, said: “The evidence of the damage from climate change has never been clearer, but the UK’s current approach to adaptation is not working. The national adaptation plan published last July, known as Nap3, was the third in a series of five-yearly updates in response to an assessment of climate risks, required under the 2008 Climate Change Act, from the Department for Environment, Food and Rural Affairs.

“But the CCC found that although it was an improvement on previous efforts, the new plan was still inadequate and required improvement before the next scheduled update in 2028.

“King said: “Defra needs to deliver an immediate strengthening of the government’s programme, with an overhaul of its integration with other government priorities such as net zero and nature restoration. We cannot wait another five years for only incremental improvement.”” https://www.theguardian.com/environment/2024/mar/13/uk-climate-crisis-plans-fall-far-short-of-what-is-required-ccc-says?CMP=Share_iOSApp_Other

For further reading – https://www.bbc.co.uk/news/science-environment-66148239

Counting on … day 61

7th March 2024

“The International Energy Agency Agency (IEA) is a Paris-based autonomous intergovernmental organisation, established in 1974, that provides policy recommendations, analysis and data on the global energy sector. The 31 member countries and 13[1] association countries of the IEA represent 75% of global energy demand… The core activity of the IEA is providing policy advice to its member states and Associated countries to support their energy security and advance their transition to clean energy.[3] Recently, it has focused in particular on supporting global efforts to accelerate clean energy transition, mitigate climate change, reach net zero emissions, and prevent global temperatures from rising above 1.5 °C.” (https://en.wikipedia.org/wiki/International_Energy_Agency)

It seems strange that the membership does not include any of the oil states from the Middle East, and very few African nations who surely have an equally vested interest in energy security.

Back in 2021, the IEA declared that the exploitation and development of new oil and gas fields must stop if the world was to stay within safe limits of global heating and meet the goal of net zero emissions by 2050. It is thus worrying that so many countries and so many companies have since then continued to grant licences and develop new oil and gas fields. The UK’s current government is even proposing to increase the frequency with which it issues new licenses!

This message was reinforce in 2023 when, having noted the strong growth in clean energy provision, the IEA reported that whilst there was no longer a need to maintain current investment levels in fossil fuels, investment in oil and gas was in fact twice what would be necessary to achieve net zero emissions targets. (https://origin.iea.org/reports/world-energy-outlook-2023)

On the plus side, the IEA’s report of March this year on clean energy, notes: “The deployment of solar PV, wind power, nuclear power, electric cars, and heat pumps from 2019 to 2023 avoids around 2.2 billion tonnes (Gt) of emissions annually. Without them, the increase in CO2 emissions globally over the same period would have been more than three times larger.” (https://www.iea.org/reports/clean-energy-market-monitor-march-2024

Green Tau: issue 87

8th February 2024

What is the purpose of running a business?

A business is an enterprise that sells something it makes or sells a service it provides. It can be a one person operation or a multinational employing thousands.

The business operation will incur costs and will remain viable provided it covers those costs. The business may need capital to get started or to expand it operation, and it may need loans to balance out peaks and troughs in its cash flow. Usually the business will over time earn more from what it sells than its costs and so makes a profit. Such profits are usually kept by the people owning the business. In some cases that might be some or all of the people who work in the business, in some cases it might be both employees and customers (eg a cooperative), and in some cases it might be external shareholders.

The success of a business is usually equated with its ability to make a profit. A successful business makes large profits, less successful businesses make smaller profits, and those that make no profit close down.

But is profit the only way of measuring success? What about customer satisfaction? What about being a good employer? What about the business’s contribution to the stability and wellbeing of the local community?

Thames Water makes high profits and has the worst for receiving complaints from customers. Might a more successful water company be one that best provides what customer need – clean, reliable drinking water?

Amazon is highly profitable company but many of its employees are both poorly paid and subject to stressful working conditions. Employees feel they are being constantly monitored and that even taking time to go to the toilet is counted against them. Might a successful company be one that provides long term secure employment that gives job satisfaction, wages that support comfortable living standards, and credible pension? It could be us or our neighbour or our children who are looking for gainful employment.

Small rural communities – and increasingly deprived urban communities – are finding that they have no local bank, fresh food shops, dental surgery etc as the pressure to maintain profits pushes business to leave an area or to downsize. This is not good for the local community and can become a spiral where the more businesses leave, the more quickly the area becomes depressed and the more other businesses leave. With the businesses go local jobs. The heart of the community is quickly lost. Might a successful business be one that adds vitality to its community, is valued by local people and keeps jobs and money circulating with the community?

Actually in all three of these scenarios one might feel that the customer’s wishes were not be valued by the businesses. What has happened to the understanding that ‘the customer is always right’? How often have you been held on a phone call to have the oft repeated – but barely credible – ‘Your call is important to us’ automatically relayed to you?

It does seem that the idea that the main purpose of a business is to make a profit does not benefit the consumer nor the community. Further what we are now increasingly seeing, is that the primacy of profit is also detrimental to the environment.

In Herefordshire the large number of industrial scale chicken farms has led to high levels of effluent running into the River Wye, polluting it with phosphorus and killing its wildlife.

In Spain strawberry growers have been abstracting so much water for their crops, that the Doñana national park – a renowned wetland area – is being depleted of water threatening the survival of many plants and creatures including flamingos, spoonbills and the glossy ibis.

Globally the burning of fossil fuel products has triggered an escalating climate crisis threatening all forms of life, whilst the fossil fuel companies have continued to make recording breaking profits.

One approach to this problem is to replace the traditional bottom line of ‘loss or profit’ with a ‘triple bottom line’ which measures the business’s impact over three area: economic, environmental and social – or the 3Ps: people, planet and profit. It is however harder to find ways of measuring the loss and profit aspects of people and planet, and of doing so in a way that allows for comparison across businesses. How do we put a price on community stability or clean air?

Suffolk Libraries commissioned a research company to assess the value of their libraries. Using surveys, focus groups and modelling, the researchers found ways of measuring the social impact of the services the libraries offered that translated into monetary values. They concluded that for every £1 spent, the social value gained was £6.07.

The environmental impact of a business might be measured in terms of carbon emissions, or in terms of the cost of making good damage to the environment. If the chicken farms in Herefordshire has to pay the cost of cleaning and revitalising the River Wye, it would make a significant impact on the bottom line of their businesses. In 2021 local MPs wrote to the government asking for £15 million to clean up the river.

One organisation that has developed a way of measuring better business

practices is B Lab. This not-for-profit international organisation has developed a certification system that “measures a company’s entire social and environmental performance. From supply chain and input materials to charitable giving and employee benefits, B Corp Certification verifies that a business is meeting high standards of social and environmental performance, transparency, and accountability.” Successful businesses become certified as B Corps. (For more info – https://bcorporation.uk/)

The campaign for better business practices is ongoing and seeks to include not just those businesses with a conscience, but to extend the expectation of good practice in all the 3Ps, to all businesses. B Lab UK and a coalition of more than 2400 businesses, is campaigning to amend Section 172 of the Companies Act. At present this section directs businesses should prioritise the success – ie the profitability – of the company for the benefit of its members – ie shareholders. The proposed amendment would direct that businesses should prioritise the purposes – ie the social, economic and environmental impacts – of the company. (For more info – https://betterbusinessact.org/ and https://thehumanbusiness.co.uk/better-business-act/)

Change in the way businesses operate is both possible and achievable.