Why municipal waste-to-energy incineration is not the answer to NZ’s plastic waste crisis

Since the Chinese plastic recycling market closed, 58% of New Zealand’s plastic waste goes to countries in South-East Asia. from http://www.shutterstock.com, CC BY-ND

By Trisia Farrelly

New Zealand is ranked the third-most-wasteful country in the OECD. New Zealanders produce five times the global daily average of waste per person – and they are getting more wasteful, producing 35% more than a decade ago.

These statistics are likely to get worse following China’s 2018 ban on imports of certain recyclable products. China was the world’s top importer of recyclable plastics, but implemented the ban because it could no longer safely manage its domestic and imported waste. Unsurprisingly, in 2015, China was named the top source of marine plastic pollution in the world.

Since the Chinese market closed, 58% of New Zealand’s plastic waste now goes to Malaysia, Indonesia, the Philippines, Thailand and Vietnam — all countries with weak regulations and high rankings as global sources of marine plastic pollution.

Waste-to-energy (WtE) incineration has been raised as a solution. While turning plastic waste into energy may sound good, it creates more pollution and delays a necessary transition to a circular economy.

Dirty plastics

Shipments of plastic recycling often arrive in developing countries unsorted and contaminated. Materials that cannot be easily recycled are commonly burned, releasing dioxins into air, soil and water. In response, South-East Asian countries have started returning dirty plastics to developed countries.

Several New Zealand councils have stopped collecting certain plastics for recycling offshore. They are sending them to landfill instead. Available data suggest that even before the China ban plastics made up roughly 15% of the waste in municipal landfills – about 250,000 tonnes a year. Much of this is imported plastic packaging.

Many New Zealanders are very or extremely worried about the impact of plastic waste. We cannot continue ignoring our role in the global plastic pollution crisis while dumping plastic in homegrown landfills or in developing countries.

In the scramble to find alternatives, waste-to-energy (WtE) incineration has become a hot topic, particularly as foreign investors look to establish WtE incinerators on the West Coast and [other centres]in New Zealand. Some local government representatives have endorsed WtE proposals, or raised WtE as an election issue.

Less plastic good for climate

Like landfills, WtE incinerators symbolise the linear “take-make-waste” economy, which destroys valuable resources and perpetuates waste generation.

Globally, countries are moving to circular approaches instead, which follow the “zero waste hierarchy”. This prioritises waste prevention, reduction, reuse, recycling and composting and considers WtE unacceptable.

Some New Zealanders say Nordic countries have proven that incineration is the environmental silver bullet to our waste woes. But a recent study found these countries will not meet EU circular economy goals unless they replace WtE incineration with policies that reduce waste generation. Such policies include packaging taxes, recycling and recovery rate targets, landfill bans on biodegradable waste, deposit return schemes and extended producer responsibility.

Rejecting linear approaches is also good for the climate. Actions at the top of the waste hierarchy stop more greenhouse gases than those at the bottom.

In contrast, WtE incinerators can produce 1.2 tonnes of carbon dioxide per tonne of municipal solid waste burnt. New Zealand’s zero carbon act means we have a responsibility to ensure we do not increase our greenhouse gas emissions by investing in WtE incineration.

Incinerators also cannot magic away toxins in plastic waste. Even the most high-tech WtE incinerators [[release dioxins and other pollutants into the air]. Meanwhile, toxin-laden fly ash and slag are dumped in landfills to eventually leach into the environment and contaminate food systems.

Shifting responsibility for plastic waste

To address plastic pollution, it is easy to see how prevention and reduction work better than “getting rid of” plastic once produced. Many WtE proponents argue that incineration technology can be a temporary solution for the plastic waste we have already created.

But incinerators are not short-term fixes. They are expensive to build and maintain. Large-scale incinerators demand about 100,000 tonnes of municipal solid waste a year, encouraging increasing production of waste. Investors guarantee returns on their investment by locking councils into decades-long contracts.

The only real solution to our plastics problem is through regulation that moves New Zealand towards a circular economy. We can start by making the linear economy expensive by increasing landfill levies above the current $NZ10/tonne and expanding it to all landfills. We must also invest in better waste collection, sorting and recycling systems, including a national network of resource recovery centres.

Instead of burning or burying plastic that cannot be reused, recycled or composted, we can prevent or reduce it through targeted phase-outs. The government is proposing to regulate single-use plastic packaging, beverage packaging, electronic waste and farm plastics through mandatory product stewardship schemes. This would make manufacturers responsible for the waste they produce and provide incentives for less wasteful and toxic product design and delivery systems (e.g. refill stations).

All of these circular solutions will provide far more jobs than WtE incineration.

Without a swift, brave shift to a circular economy, New Zealand will remain one of the world’s most wasteful nations. Circular economies are developing globally and WtE incineration will only set us back by 30 years.

Hannah Blumhardt, the coordinator of the NZ Product Stewardship Council, has contributed to this article. This article is republished from The Conversation under a Creative Commons license. Read the original article.

Zero Carbon: It’s not just a good idea, it’s the law

By Robert McLachlan

Two years into New Zealand’s Labour-led government, the long-delayed Zero Carbon Bill became law on 7 November. Passed essentially unanimously, the lengthy public debates and political manoeuvring faded away until the final passage was even anticlimactic:

So it’s worth remembering just how significant this new law is. We will start seeing action almost immediately. (The previous emissions target, not set in law, was for a 50% reduction in emissions by 2050, with no plan how to get there.) The Climate Change Commission will determine the first three carbon budgets (covering 2022-2025, 2026-2030, and 2031-2035) by February 2021, and the government will respond by the end of that year. Judging from experience in the UK, those budgets will have to show more or less a straight line to net zero by 2050. That’s completely different to where we are heading now.

Our gross CO2 emissions in 2017 were at their highest level since 2008. Land transport emissions jumped 6% in one year alone, and, with the fossil-fueled vehicle fleet continuing to increase by 140,000 vehicles each year, that’s likely to continue for some time. Clearly the Commission is going to have to recommend some strong measures. Very soon we will find out what the Zero Carbon Bill is made of.

No
No
Not this either
Caution

While some other countries have net zero targets in place, when this bill was introduced in May, only Norway and Sweden had set the targets in law. Since then, France and the UK have followed suit. Significantly, these laws are an effort to respond in detail to the 1.5ºC target and to base national plans around the science reported by the IPCC.

New Zealand has learned from processes that have worked elsewhere, notably the UK’s Committee on Climate Change, which attempts to balance science, public involvement and the sovereignty of parliament. Ireland and Sweden are also following this model.

The few tweaks to the bill since its introduction have mostly strengthened it.

First, the Climate Change Commission will now make recommendations on gross emissions reductions and offsets through planting trees. This is vital, as current roadmaps to reach net zero by 2050 involve planting enormous numbers of trees, and (because landowners can be paid for the carbon stored in the trees) there are signs of a “Green Rush” already under way, despite questions about the net environmental and climate impact of plantation forestry.

Second, the focus has shifted slightly to emphasize domestic reductions over purchasing overseas reductions. Good news, since our track record in the latter is appalling.

Third, legal accountability has been strengthened slightly, although there is still no legal recourse if a carbon budget is missed.

Fourth, the Commission is now asked to advise in 2024 on whether to include international aviation and shipping in the target. At first sight, this is disappointing, since this is a large area of emissions that is at present unaccounted for and that is growing rapidly. The next five years should be spent making a start on what is known to be a difficult area. For example, the UK’s CCC is already trying to get their government to include these emissions. The EU has pointed out that jet fuel is effectively subsidised, and has proposed that it be taxed at 57 cents per litre to level the playing field. Even Air New Zealand, in their submission on the bill, did not ask for this delay.

Remember that global emissions are still rising. Even in the best-performing countries, substantial progress so far has been limited to essentially one area, electricity. We need to get the right agreements and structures into place so that when we start tackling harder areas like industry, transport, and buildings, we can find strategies that work and that everyone can get behind. That’s what the Zero Carbon Bill does.

It’s a massive achievement.

Politics & the Anthropocene

Potash mine, Russia. Photograph by Edward Byrtynsky, The Anthropocene Project

The Anthropocene is a proposed geological epoch marked by human impact on the earth and its systems. Popularized around 2000 by Paul Crutzen, it has not yet been officially accepted by geologists, and many aspects of it remain hotly debated.

Political scientist Duncan Kelly talks democracy, protest, time scales, fatalism, and the limits to growth in this interview with Robert McLachlan at the LSE Review of Books.

I’m so fly, I’m #NoFly!

#NoFly: Walking the talk on climate change, by Shaun Hendy. BWB Texts, 2019. Reviewed by Robert McLachlan

In June 2018, Swede Maja Rosén founded We stay on the ground with a pledge not to fly in 2019, and a goal of persuading 100,000 other Swedes to join her. In August, her compatriot Greta Thunberg began her school strike for climate. 

Today, the No Fly movement has spread around the world, with the Flight Free 2020 campaign reaching eight countries, and Greta is a household name, with the September strikes drawing 4 million people globally. What a difference a year makes!

The New Zealand scientist Shaun Hendy made his own flight-free year in 2018, attracting widespread publicity in the media, partly thanks to Stuff‘s “Quick! Save the Planet” series. In #NoFly he describes why he made the pledge, how it worked out, and how he sees New Zealand’s low-carbon future playing out.

Shaun credits University of Auckland psychology professor Quentin Atkinson for giving him the push he needed. The theory of “costly signalling” says that people can better send honest signals about themselves if their message is accompanied by taking some action that requires effort. (Philanthropy, risk-taking, and conspicuous consumption are the classic examples.) Indeed, psychological studies have found, not surprisingly, that people strongly dislike hypocrisy and regard hypocrites as untrustworthy (whereas lying, strangely enough, is all right). 

This is a very short book with just four short, tightly-organized chapters. Chapter 1 describes Shaun’s actual experience of travelling around New Zealand by train, bus, and electric car. He succeeded, and enjoyed a lot of the trips, but, needless to say, he finds that we need a huge improvement in our intercity public transport. Chapter 2 is a whirlwind tour of the discovery of climate change, from the birth of the industrial revolution, to the early speculations about the greenhouse effect by Joseph Fourier in the 1820s, to Svante Arrhenius’s landmark 1896 paper “On the influence of carbonic acid [CO2] in the air upon the temperature of the ground” establishing the basic principles of global warming by the burning of fossil fuels, to its widespread understanding by scientists by the 1980s. (Incidentally, Arrhenius’s second cousin’s great-great-great-granddaughter is Greta Thunberg, and her father, Svante Thunberg, is named after him. How good is that?!) After that, the story turns murky, as emissions have skyrocketed in the past thirty years and we are now faced with the prospect of catastrophic climate change.

There are some New Zealand connections, too, and here I can’t resist including the now-famous report in the Rodney and Otamatea Times of 14 August 1912:

Understanding how this could have happened is the subject of Chapter 3, focussing on scientists’ efforts to communicate the dangers and how this message  was received. Hendy bases his interpretation on Jess Berentson-Shaw’s A Matter of Fact: Talking Truth in a Post-Truth World (BWB Texts, 2018), where it is argued that scientists need to base their messages on values that are shared with their audience. They should be aware of their own values and how they affect the questions that they choose to study and how the results are communicated. For example, Mason Durie’s 2018 Manawatū Lecture contrasted ‘knowledge transfer’ (such as teaching postgraduate students) as a scientific value with ‘community understanding’ as a mātauranga Māori value.

Many, many factors have brought us to where we are now and still prevent decisive action. They include the power of the fossil fuel companies and their disinformation campaigns, the investors who fund the expansion of fossil fuels and the machines than burn them, our inherent short-term bias – particularly evident in some democracies –, the apparent advantages of freeloading, and the rise of neoliberal economic management, all of which are symptoms of an underlying global tragedy of the commons. On top of this, politics and social media have taken such a bizarre turn in recent years that academics and thinkers of all stripes are scrambling to make sense of the developments and to suggest solutions. 

Apart from the psychology of communication and belief formation, behavioural psychology and sociology could well be places to look for answers too. People live in suburbs, drive cars everywhere, and holiday on the Gold Coast because everyone around them is doing it, and because those were the obvious choices. A lot of climate work focuses on the top level (government and international policy) and the bottom level (individual action). The middle levels, communities, organizations, and their networks, are surely important too. Climate change will only be solved by collective action. It is important to understand how collective action – a complex interplay between government leadership, public support, and civic organizations – is achieved.

Chapter 4 closes with a vision of a low-carbon future for New Zealand, involving denser cities, less travel, and improved (and low-carbon) vehicles and public transport. Unfortunately, tiny steps in this direction are not going to get us there in time.

Emissions are rising rapidly. Hendy’s numbers for aviation are a bit out of date: while domestic aviation emissions are flat (due to more efficient aeroplanes), international emissions are sharply up.

Annual gross New Zealand emissions. Aviation figures include the effects of radiative forcing at 1.9 times the CO2 emissions. International aviation includes outgoing flights only. Source: MfE

Globally, it’s the same story, with air travel up 77% in eight years, now standing at 1000 km per person per year:

Source: International Civil Aviation Organization

Hendy rightly places a lot of emphasis on how New Zealand families are now widely dispersed around the world, and the value of (some) work travel. However, for both residents and visitors,  friends and family are the reason for 28% of trips; work, education, and conferences are 15%. Holidays make up 57% of all trips. The same is true globally where work trips are a tiny portion of all flying. Unprecedented levels of migration are creating more dispersed families. And all projections are for continued rapid increases.

Land transport emissions are also rising sharply as the country is flooded with cars – we now have the highest vehicle ownership rate in the OECD. Despite all the media coverage of electric vehicles, the fact is that the petrol and diesel fleet is increasing by around 140,000 vehicles per year. It’s going to take some time, some strong measures, and some major shifts in public opinion to turn this around.

On aviation, it’s true that there are no easy solutions. We have to start with baby steps, and to my mind the most urgent of these is to bring international aviation into the Emissions Trading Scheme. Domestic flights pay a carbon charge, international ones do not. At present prices, an Auckland–Brisbane return flight (1 tonne CO2e) would cost an extra $25. Not much, and not much of a deterrent, but the point is it would bring these emissions under the falling cap on emissions that the Zero Carbon Bill will bring in. 

Collins crushes climate

By Robert McLachlan

An essay by Judith Collins MP reported on Carbon News yesterday seems to show an alarming shift in attitude within the National Party. Collins argues against the Zero Carbon Bill, the Paris Agreement, and downplays the magnitude of climate impacts.

The Paris Agreement was adopted in December 2015 and ratified by the New Zealand Government, of which Judith Collins was a cabinet member, in October 2016. This involved agreeing to strengthen the global response to the threat of climate change by

Holding the increase in the global average temperature to well below 2°C above pre-industrial levels and pursuing efforts to limit the temperature increase to 1.5°C above pre-industrial levels, recognizing that this would significantly reduce the risks and impacts of climate change.

The Zero Carbon Bill implements this agreement for New Zealand. It implements what the National-led government agreed to when they signed the Paris Agreement, which Judith Collins now states “is not justified by any scientific findings” – this after innumerable scientists and delegates, including those of the New Zealand government, pored over and agreed to every word. Since the Agreement was signed, the IPCC 1.5ºC report – “1.5 to Stay Alive” – has strengthened the case for 1.5ºC. There is a broad consensus, both in New Zealand and internationally, about what needs to be done. Contrary to what Collins claims, the NZ emission target does not have “almost zero chance of being achieved”; it is entirely feasible and will lead to health and economic benefits for all New Zealanders. 

As for “there is no indication they [the costs of global warming] are insurmountable”, it partly depends on what value you place on mass extinction and the loss of treasures like the Great Barrier Reef, not to mention coastal cities. How can this be surmounted?

The existential risks are real if difficult to size up. Hans Schellnhuber, founder of the Potsdam Institute for Climate Impact Research and climate advisor to the EU, Angela Merkel, and the Pope, said in 2018, “I think there is a very very big risk that we will just end our civilisation. The human species will survive somehow, but we will destroy almost everything we have built up over the last two thousand years. I think we have more than a five percent chance of [preventing this]. But it’s definitely less than 50% in my view.”

If Ms Collins believes “any politician… who questions global warming policy instantly being ostracised as the equivalent as a global warming ‘denier’”, she would be well advised not to include statements like “assuming the IPCC models reflect the relationship between carbon dioxide and global warming” in her essay. Certainly 600 commenters interpreted her post as support for a science denial position, with everything from sunspots, Noah’s Ark, volcanoes, Al Gore, change is normal, plants need CO2, to the ice caps on Mars getting an outing.

The faster we cut emissions, the slower the impacts of climate change will be, and the easier it will be to adapt. The mechanisms in the Zero Carbon Bill constitute a tested, measured, and reasonable way to do this.

Originally published on Carbon News. See the original article.

Hopped out

By Steve Trewick

Stand at the side of a mainland island reserve and the impact of humans on New Zealand’s natural environment is obvious. From a landscape naturally dominated by tall forest, agricultural ‘improvement’ rapidly moved us to a uniform, virtual biological desert. Not only are the trees and birds missing, but the lichens, fungi, insects, worms and molluscs are gone. Even the bacteria and other microbes of the soil are replaced. In response we resort to counting species and prioritising conservation efforts on the scarcest and restoration effort on the rarest habitats. But, wholesale environmental changes alter not just the abundance of native species but their ecology and interactions. Ultimately, by restructuring the landscape we alter evolutionary outcomes and this has become increasing apparent as research explores biological responses to human induced climate change.

Predator fence on boundary of native forest and exotic paddock. Bushy Park sanctuary near Wanganui.

An obvious difficulty with understanding environmental change is that it is much easier to say what is, compared to what was. We are readily inured to the situation and so are accepting of the status quo. One very powerful tool that has helped biologists understand how the geographic ranges of species and population change over time is phylogeography. Simply put, this approach combines information about where individuals and populations of a species are found with information about how those individuals are related to each other. DNA sequence data reveals how closely related individuals are (their genealogy), and how genetically diverse populations are. It is this type of data that shows, for instance, how our human ancestors left Africa and migrated into Europe, then Asia before eventually colonising islands in Oceania. We now know that New Zealand was probably the last major island to have be reached by people travelling by foot and finally boat.

Genetic data from living people has revealed how their ancestors migrated from Africa around the world (values are years before present).

Since the 1990’s phylogeographic studies have revealed the influence of many environmental factors on the distribution of biodiversity. In particular, natural, global climate cycling during the last few million years of Earth’s geophysical prehistory (the Pleistocene epoch) is known to have been influential. We now know for example that in the northern hemisphere repeated extension of the arctic ice cap during ‘glacial’ episodes extinguished populations of all species in northern Europe, Asia and America; remnant populations survived in warmer southern areas. As climate alternately warmed and cooled over 10–100 thousand year cycles, the ranges of animal and plant species expanded and retracted in response.

Estimated distribution of vegetation types in New Zealand during the Last Glacial Maximum. See Wild Life New Zealand.

In New Zealand a related pattern of species range change has been inferred. Pollen records show where plant species once lived and genetic data show that during cold phases of the Pleistocene, forest reduced and was replaced in many areas by scrub / grassland communities. Animal species are expected to have responded to these changes tracking their preferred habitat in space and time (or going extinct), and this has been found to be the case for some. North Island tree wētā, for instance, appear to have tracked climate niche.

A recent study examined the response of two related grasshopper species. These endemic Phaulacridium grasshoppers live in low elevation habitat, but as is typical of short-horn grasshoppers in temperate regions they require open habitat so they can gain heat by basking in the sun. That means Phaulacridium grasshoppers do not live in forest, and they do not survive above the treeline in the subalpine zone where cool temperatures prevent trees growing (other grasshoppers are adapted to those conditions). So space for Phaulacridium would have been restricted in prehuman New Zealand to scarce open areas such as coastal dunes, river flats, wetlands and semi-arid areas.  In fact, one species (Phaulacridium otagoense) occurs today only in the semi-arid McKenzie – Alexandra area of Central Canterbury and Otago. The other  species (Phaulacridium marginale) is today found in many places around the country.

Vegetation types across New Zealand before arrival of people (left) and in modern times (right).
Known occurrences of the two New Zealand Phaulacridium grasshoppers.

A small species range usually means a small population size, compared to a species with a big range; and small populations usually have a lower level of genetic variation. Low genetic diversity is documented in many endangered species such as the famous black robins of the Chatham Islands. Paradoxically, in Phaulacridium the opposite pattern exists; the species with the smallest range (pink in map) has much higher genetic diversity than the widespread more common species. The simplest explanation is that P. otagoense (pink),  had until recently a much larger range and so bigger population. Conversely, P. marginale (turquoise) appears to have expanded its range recently and has not yet had time to accumulate new genetic diversity.

Niche models for Phaulacridium otagoense indicating optimal habitat (red, orange) during the last glacial phase may have been similar to today.

It is known that global temperatures had recovered from the last cold phase of the Pleistocene by about 15,000 years ago. Perhaps P. otagoense had a much larger range in the period before that when cooler, drier conditions allowed scrub grassland to expand; similar to conditions where it occurs today? Niche modelling indicates that in current conditions the potential range of this species is bigger than the actual range in which it is found, and  taking into account estimated temperatures during the last glaciation suggests that the habitat preferred by this species had not been much more extensive.

So, probably the major change in fortunes for these Phaulacridium species relates mostly to the recent expansion of P. marginale. Climate modelling shows that the range of this species today is close to the potential occupiable range, but there is a problem. Although the climate across much of New Zealand suits this grasshopper, other factors in the environment do not. In particular, the presence of native forest excludes these little grasshoppers because they need to bask in the sun every day to warm up. How has P. marginale become so abundant and widespread?

The answer lies not in global climate change, but in recent anthropogenic changes to the environment much closer to home. By removing New Zealand native forest, humans created a landscape with the climatic conditions to allow P. marginale to increase in abundance and expand its range across the country. The addition of a mix of northern hemisphere grasses and herbs that thrive in this artificially open environment provided the nutrient-rich food for P. marginale. So that’s great! Well no.

Males and females of different species are capable of reproduction when they meet due to anthropogenic habitat change, resulting in loss of diversity. Male Phaulacridium otagoense with female P. marginale.

The increase in available habitat has meant that the spatial range of P. marginale now meets the range of P. otagoense. Where they meet, the grasshoppers makes mistakes when choosing mates resulting in gene flow. Genetic evidence shows that pure P. otagoense remain in only part of their natural ecological range. Genetic mixing is of course part of the natural evolutionary mill, but around the world human activity accelerates the rate at which species meet and interact in new ways. The Anthropocene may come to be characterised by global biological homogenisation and biodiversity loss because these creatures cannot opt out of the mess.

Fly less, Kiwis!

By Robert McLachlan

Something’s happening here:

Climate crisis: ‘We don’t fly to go on holiday now – and it doesn’t cost the earth’ (The Guardian, 10 August 2019)

No-fly zone: Could you give up flying if it meant protecting the planet? (Adventure.com, 21 August 2019)

Travel the world without destroying it (The Conversation, 22 August 2019)

Harry and Meghan tried, but can we really make our flights carbon neutral? (The Observer, 24 August 2019)

Climate change: Should you fly, drive or take the train? (BBC, 24 August 2019)

Cheap, easy and endless: The big lie about plane travel (Sydney Morning Herald, 30 August 2019)

A Future Without Long-Haul Vacations (The Atlantic, 2 September 2019)

In New Zealand, the Facebook group Fly-less Kiwis was formed to focus attention on the need to reduce air travel. Unlike some campaigns, which encourage people to stop flying completely, either for a year or forever, its aim is simply to spread awareness of this issue and to support its members’ decisions to eliminate unnecessary flying.

Aviation accounts for up to 8% of global greenhouse gas emissions. (Other sources put the figure lower, at 2-3%, but this refers to only the direct CO2 emissions, not the total climate impact due to water vapour, nitrous oxides, contrails, and aerosols.) Aviation is growing extremely quickly, up 75% in 8 years:

Source: ICAO

and is projected to rise by 200-360% by 2050:

Source: ICAO 2013

So far, few countries have any measures in place to rein in the growth of aviation. Some flights incur a carbon price (for example, domestic flights in New Zealand and internal flights in the EU). The UK departure charge is partly carbon based – £78 for a long-haul flight. This really is a global issue: New Zealand’s aviation emissions, at 0.8 tonnes CO2/person, are not so different from those of other developed countries.

(To be clear, while aviation is important, it’s not one of the top issues in climate change mitigation, which remain (both in New Zealand and globally) electricity generation, land transport, and economy-wide carbon pricing.)

Paul Callister, a founder of Fly-less Kiwis, writes:

Many of us on this group probably grew up not doing much flying. We used other means if traveling within NZ and even overseas. Then in our midlife we may well have done quite a bit through our work and for leisure. Now we are pulling back or stopping for climate change reasons. But when I mention this issue to many younger people (in hopefully a casual way not a preaching tone) I sense a moment of horror. The middle class amongst them grew up with hyper-mobility. Their first school trip may have been to Vietnam rather than Auckland. They have been to Sydney or the islands half a dozen times and may have been an exchange student in Europe. Even the environmentally committed, who are leading social media campaigns and/or going to protests, cannot easily see a life without flying or reduced flying. So if one looks at a ‘lifetime emissions’ profile, many of us used up our share in midlife, while these young people have already used theirs up. It’s going to be a real challenge for them.

and:

I think we can almost categorise air travel into three broad groups:

1. Vital (air ambulances, disaster relief etc).

2. Important (visiting overseas relatives, going to the occasional overseas scientific conference).

3. Trivial (I would suggest that weddings in Rarotonga, flying all the guests in, would count as that). So you do not worry about the vital group. You work hard to minimise the impact of the important category. And you put in place a whole heap of disincentives for the trivial travel.

One year has made a huge difference in the amount of attention given to aviation and climate change. Let’s make 2020 the year in which awareness turns into action.