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How does Peter Singer's figure of 750 million fit within the range of estimates on 'climate change refugees'? Q&A

The Conversation is fact-checking claims made on Q&A, broadcast Mondays on the ABC at 9.35pm. Thank you to everyone who sent us quotes for checking via Twitter using hashtags #FactCheck and #QandA, on Facebook or by email.

Excerpt from Q&A, August 2, 2016, watch from 1.12.

PETER SINGER: That is going to basically inundate every coastal city around the world, including, of course, all Australian major cities are coastal. It is going - estimated to cause something like 750 million refugees just moving away from that flooding. Never mind those who also because refugees because (indistinct)…

VIRGINIA TRIOLI: Some of those claims are contested, of course?

PETER SINGER: Well, they are contested but do you want to take the chance, right? – Peter Singer, Ira W. DeCamp Professor of Bioethics, Princeton University, speaking on Q&A with host Virginia Trioli, August 2, 2016.

Ethicist Peter Singer told Q&A that climate change-related sea level rises are “estimated to cause something like 750 million refugees just moving away from that flooding”.

It is beyond the scope of a FactCheck to say with any certainty what will happen in the future. And there is no single official data source on the numbers of people who migrate because of the impacts of climate change, partly because there is no legal definition of a “climate change refugee”. Furthermore, most such displacement occurs within countries, not across international borders, and is always due to a number of different factors. Finally, there is no systematic monitoring of such movement.

That said, we can check how Singer’s figure of 750 million fits within the range of estimates that exist on this question.

Checking the source

When asked by The Conversation for sources to support his statement, Peter Singer said:

Factchecking always welcome! My source for the figure is Climate Central and in terms of the possible extent of sea level rises, please see this paper by Hansen et al.

The figure I gave is near the top end of the Climate Central range, but remember that I agreed with Virginia Trioli that this is contested. I argued that if it is even a small chance, the stakes are too high to be worth taking the risk.

Climate Central is a group of scientists and journalists researching and reporting climate change and its effects. In 2015, the group said that:

Carbon emissions causing 4°C of warming — what business-as-usual points toward today — could lock in enough sea level rise to submerge land currently home to 470 to 760 million people, with unstoppable rise unfolding over centuries.

Predictions vary and uncertainties abound, but climate scientists say it is possible we may reach 4°C of warming by 2100 if insufficient effort is made to reign in emissions.

As Singer acknowledges, his figure of 750 million is at the upper end of estimates – and he readily agreed that estimates are contested.

Without detracting from Singer’s broader point about the human consequences of climate change, it is worth taking a closer look at the context, assumptions and methodologies behind some of these alarming-sounding figures.

What does Singer’s source say about climate refugees?

When Climate Central released its Mapping Choices report in 2015, the headline it used on its website was “New Report and Maps: Rising Seas Threaten Land Home to Half a Billion”.

But to be clear, Climate Central’s full report did not say that 750 million people would need to move away due to rising sea levels – in fact, unlike Singer, it didn’t use the term “refugees” at all.

Instead, it said only that under a 4°C warming scenario, there could be “enough sea level rise to submerge land currently home to 470 to 760 million people” (emphasis added).

Many people would indeed move in that scenario – but past experience from around the world means we can be confident that many would also stay and try to live with a changed environment.

The Climate Central report acknowledges that its estimates do not take adaptation strategies into account, noting:

Results do not account for present or future shoreline defences, such as levees, that might be built, nor for future population growth, decline or relocation.

A vast range of estimates – and plenty of guesswork

Some of the numerical estimates on climate-related displacement are based on crude methodologies, as explained in my 2012 book, Climate Change, Forced Migration, and International Law.

For example, in 1993 social scientist Norman Myers wrote a paper suggesting that 150 million people could be displaced by climate change by the the mid-21st century. He had identified areas expected to be affected by sea-level rise, and then calculated the anticipated population of those areas in 2050. In subsequent work and interviews, he said the figure could be closer to 200 million or 250 million. Estimates ranging from 50 million to 600 million to even a billion have been cited by some.

The Observer published an article in 2010 headlined “Climate change will cost a billion people their homes, says report”.

However, that report misconstrued a paper by Dr François Gemenne – whose work is empirically based and well-reasoned – that referred to the Intergovernmental Panel on Climate Change’s (IPCC) comment that freshwater availability in a changing climate may adversely affect more than a billion people by the 2050s. That’s a different story from the one told in The Observer’s headline.

Many of these upper end estimates – and the methodologies used to calculate them – have been criticised by other researchers, who note that very big estimates often fail to account for adaptation.

The IPCC itself has said that:

Estimates of the number of people who may become environmental migrants are, at best, guesswork.

How much weather-related displacement of people have we seen so far?

Peter Singer’s comment was about future impacts of climate change. But what do we know about current and past climate-related movement?

The best statistics on this are published by the Internal Displacement Monitoring Centre (IDMC), the leading source of information on internal displacement whose role has been endorsed by the UN. It said in its Global Estimates 2015: People displaced by disasters report that:

Since 2008, an average of 22.5 million people have been displaced by climate- or weather-related disasters [each year].

Internal Displacement Monitoring Centre (IDMC)

These figures were also recognised in the Nansen Initiative’s Agenda for the Protection of Cross-Border Displaced Persons in the context of Disasters and Climate Change, endorsed by 109 States (including Australia) in late 2015, and by the UN Secretary-General’s report on refugees and migrants prepared for a high-level summit on large movements of refugees and migrants to be held in New York in September 2016.

Verdict

Are rising seas “estimated to cause something like 750 million refugees” to have to move, as Peter Singer said? Not according to the source he provided, which actually found that sea level rises under a 4°C warming scenario could submerge land currently home to 470 to 760 million people; the report didn’t say that all or most would subsequently become refugees.

As Singer acknowledged, his figure of 750 million people being affected by climate change-related flooding in future is at the upper end of estimates – and is contested. The methodologies and assumptions underpinning some of the upper end estimates have been critiqued by scholars, as they often do not adequately account for adaptation. – Jane McAdam

Review

In general, I and others in the migration field would strongly agree with the author’s sound critique of Singer’s assertion.

Human mobility in the context of climate change is complex. Limits to a more nuanced understanding of this issue may be due to a lack of agreement on the legal definitions and the methodological choices made to project numbers of environmental migrants, as well as - importantly - an understatement of the agency and adaptive capacities of people.

Communities in coastal and low-lying areas that may be affected by sea-level rise in the future are affected today by recurrent natural hazards, coastal erosion, land subsidence, and saltwater contamination of arable land.

Empirical studies, including from the United Nations University, have explored how migration contributes to livelihoods and household adaptation strategies.

Experts tend to agree that the types of movements that might fall under that moniker “climate migrant” are varied and complex. Robust estimates by the Internal Displacement Monitoring Centre fall short of accounting for people living in prolonged displacement, displaced across borders (generally agreed to be a minority), or migrating away from their homes due to the long-term effects of climate change (erratic weather, droughts, and the gradual loss of land). The last grouping may be the largest – and would be considered labour migration under current definitions.

The author’s section on weather-related displacement rightly adds an important dimension to a focus on sea-level rise, which is by no means the only cause of movement. An additional important point: climate change experts have largely been reluctant to attribute any individual weather event to climate change, thus making it difficult to attribute displacement due to climate- or weather-related disasters to climate change. – Julia Blocher

Have you ever seen a “fact” worth checking? The Conversation’s FactCheck asks academic experts to test claims and see how true they are. We then ask a second academic to review an anonymous copy of the article. You can request a check at checkit@theconversation.edu.au. Please include the statement you would like us to check, the date it was made, and a link if possible.

Jane McAdam receives funding from the Australian Research Council and the Research Council of Norway.

Julia Blocher has previously received funding through the project “High-End cLimate Impacts and eXtremes” (HELIX - http://helixclimate.eu/home), funded by the EU Seventh Framework Programme for research (FP7). She is an associate member of the Hugo Observatory at the University of Liege, an interdisciplinary research group exploring migration phenomena related to environmental factors and climate change. The Hugo Observatory is directed by Dr. François Gemenne, who is referred to by the other author in this article.

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The new instruction from Science Minister Greg Hunt to restore climate science as a “core activity” at Australia’s peak science body, the CSIRO, is a ray of hope for public good science.

Yesterday, Hunt told Fairfax Media he had issued a directive to CSIRO executives to add 15 jobs and A$37 million over ten years to CSIRO’s climate science research program.

The move follows months of uncertainty over CSIRO’s climate research capability, after chief executive Larry Marshall announced in February that 350 jobs would be lost from CSIRO, including cuts to the oceans and atmosphere division.

After widespread condemnation, losses to climate science capacity have reportedly been significantly reduced, although it is still unclear exactly how many and where the losses will be felt.

So what does the new development mean for CSIRO and Australia’s climate science?

The role of CSIRO

Reinstating 15 jobs is certainly a step in the right direction, even if they don’t make up for the previous cuts. But perhaps even more significant is the statement of intent – that the government wants climate science, and wants it to be done by CSIRO.

This is important because these government-funded agencies are well placed to carry out sustained observations and the accompanying development of climate models. Here in the university sector we focus mostly on “blue sky”, discovery-based research and training the next generation of researchers and PhDs. These are very important roles, but we can’t run marine research vessels or decades-long observation programs, because university research generally relies on three-year grant cycles.

The minister’s announcement is a very important cultural acknowledgement from the government that it needs to ensure that its publicly funded agencies underpin those important areas of climate monitoring and modelling.

Key investments

There are two key areas in which Australia needs to invest.

The first is sustained observations of the southern hemisphere’s oceans and atmosphere. As one of the few nations in the region with the capacity to monitor this vast area, Australia arguably has an obligation to make these measurements.

The second is developing next-generation climate models for Australia and the world. Northern hemisphere modelling groups, even though they do global modelling, have pressures from their own governments to focus on high-quality simulations of their own regions. Without Australia doing the same, there’s not the same pressure to have superbly accurate forecasts for this part of the world.

These two areas need to be secured via an appropriate scale of investment in climate science. Where this new money should go depends on exactly where the cuts have been made and what needs to be restored.

Government steps up

For some time now, CSIRO’s executive has been making moves away from public good research and towards an agenda of “innovation”.

While investment in public good climate research might not make you money this year or next, it can save vast amounts of money by, for example, avoiding poor investment in infrastructure. It is vital science that is needed to secure a resilient economy, a resilient environment and social well-being for all Australians.

This type of research is often undersold. Unfortunately, the culture in CSIRO over the past year seems to have been to sacrifice some of that public good science and focus on more lucrative research. This is important and beneficial science as well, but you can’t drop the public good.

Hunt’s new comments are important because they show the government is taking renewed responsibility for how CSIRO invests in research that helps the public.

This isn’t just about climate science; it’s about any area of public-good research that delivers what the community needs for societal well-being.

Restoring reputations

This is an important step towards restoring Australia’s international reputation in climate science. The science is always judged by the excellence of the work being done and papers published, which will take a while to materialise, but this announcement will be applauded around the world.

The cuts were condemned by thousands of international researchers as well as the World Climate Research Program of the World Meteorological Society and the director of a NASA-led atmospheric monitoring network.

CSIRO’s international reputation in climate science has been going down the gurgler ever since Royal Society Fellow Trevor McDougall, one of the most influential oceanographers Australia has produced, was cut in 2012 to worldwide condemnation. The recent cuts went further.

We often criticise ministers for what they do wrong, but the latest announcement is a real cause for hope. Until now the government had taken a hands-off approach, arguing that CSIRO is an independent statutory body that shouldn’t be interfered with.

That’s now been thrown out. This is public money, and the government is saying we need to get public-good value from it.

Matthew England receives funding from the Australian Research Council.

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Gas exports are driving massive growth in Australia's gas demand. Ken Hodge/Flickr, CC BY

Concern about higher and more volatile gas prices in southern and eastern Australia is spreading. Recent gas price spikes in South Australia have impacted on electricity prices and raised concerns about future prices for industry and households.

Average gas prices for large industrial consumers rose by 60% between 2010 and 2015, while household prices climbed by 20%. But prices vary a lot from state to state.

In industry, most gas is used for process heat, while in homes, space and water heating are the big gas consumers.

Gas also provides around 22% of Australian electricity, and around 45% in South Australia. The dramatic increase in liquefied natural gas (LNG) exports from Queensland has provoked fears of much bigger future price hikes. It has also made it difficult for major industrial users to negotiate reasonably priced new contracts.

Many are proposing the obvious, but wrong, solution: develop more gas production resources. But this path fails for several reasons.

We don’t need more gas

First, as global citizens, we must recognise that most of our existing economic fossil fuel resources must stay in the ground. Developing more gas supply will just make it harder for Australia to transition to low-carbon energy over the next few decades.

Second, the problem is not about gas supply. It is about the allocation of gas and management of demand for gas and electricity. The recently opened Queensland LNG export plants are tripling eastern Australian gas demand.

What industry could cope with that scale of change without a few hiccups?

Eastern Australia has plenty of gas. The problem is that most of it is being exported at prices lower than some Australians are paying. And the price volatility resulting from the present shambles is making life difficult for some Australian industries.

gas consumption AEMO

Third, this approach would involve falling into the trap set by the gas industry, to force governments to override community opposition to coal seam gas projects. This would be socially divisive and is unnecessary.

We also need to protect our gas industry from its own shortsighted and narrow world view. Gas companies are already facing financial challenges.

Winds of change

Our responses to the problems with gas need to be carefully considered, to recognise a reality that has evolved over many years and to factor in the global context.

Consider a few facts facing the gas industry in Australia.

Australian gas users are, on the whole, very inefficient in the way they use gas. Sustained low prices have meant we still have inefficient 50-year-old boilers, outdated process technologies and wasteful management of gas use. Gas hot water services still have pilot lights (which waste energy) and poor insulation. One study has suggested that east coast gas demand could decline if we focused on efficient gas use.

Gas demand peaks in cold weather, due to the combination of gas and electric heating, which adds to higher gas use in industry and households. This drives higher prices in winter.

Improving energy efficiency, particularly high-efficiency electric technologies, combined with renewable energy and storage, means it is increasingly attractive for households and some businesses to disconnect from gas, or at least shift significant gas demand.

The electricity industry has also discouraged gas-fired cogeneration plants (plants that produce electricity and heat for industrial processes) by undercutting prices and using its market power to make it difficult to connect and sell electricity into the grid.

This is despite cogeneration being more than 25% more efficient than our most efficient large gas-fired power generators, as it produces process heat as well as electricity instead of letting heat escape into the atmosphere. It is more than twice as efficient as many of our gas turbine power stations and coal power stations.

In the recent South Australian electricity and gas crisis, the state’s most efficient gas power station was not even used until the government intervened, because it was relatively too expensive under the current market structure.

Finally, LNG export plants have locked themselves into long-term gas export contracts linked to the price of oil. The decline in oil prices has slashed their returns, and their share prices have fallen heavily.

They have created a serious problem for themselves and the Australian economy by failing to predict global oil price trends.

So what should we do?

In the short term, the government could help our gas industry to free up some of the gas now being exported.

There is a global glut of gas, so it should be possible to buy back some gas from the buyers of our LNG. Since this would not need to go through the LNG plants and shipping, it could be made available at a significantly cheaper price than its export price.

I don’t really think this is necessary if we are smart, but it provides a way of stabilising gas prices for local industry.

It is interesting to note that the government strongly rejected suggestions that some of our gas be “quarantined” for local use when concerns were emerging.

The core strategy will be multi-pronged.

First, an aggressive gas-efficiency and fuel-switching strategy must be implemented as quickly as possible. Some gas retailers are already moving, as they have realised they would be better off with efficient customers that still use some gas, instead of losing those customers if they shut down.

State energy efficiency schemes, such as the Victorian Energy Efficiency Target and NSW Energy Savings Scheme, have recently been broadened to include gas, as well as small to medium businesses, so they could be expanded.

Storage of gas, electricity and heat can smooth demand to reduce price volatility. Pumped hydro and mini-hydro systems in water supply pipes between large dams and local storages can generate electricity at times of high demand, rather than relying on gas-fired power stations.

Electricity market reform could reduce electricity demand and gas use by encouraging gas cogeneration (as well as renewable energy). This is because cogeneration is a very efficient way to use gas.

The Australian Renewable Energy Agency (ARENA) has recently published a major report on options for renewable energy to replace gas in industry. This could also be implemented.

Energy policymakers have made it clear they consider the gas market to be in serious failure mode. Rapid action could break the market power of old players.

It is really time that the gas industry developed and published a roadmap showing how it can be part of a zero-emission Australian economy.

The Council of Australian Governments Energy Council meets on August 19. Let’s hope it considers effective options, instead of band-aid solutions that will make the wounds fester.

Alan Pears has worked for government, business, industry associations public interest groups and at universities on energy efficiency, climate response and sustainability issues since the late 1970s. He is now an honorary Senior Industry Fellow at RMIT University and a consultant, as well as an adviser to a range of industry associations and public interest groups. His investments in managed funds include firms that benefit from growth in clean energy.

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