On the relation between weather-related disaster impacts, vulnerability and climate change
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Disasters such as floods, storms, heatwaves and droughts can have enormous implications for health, the environment and economic development. In this article, we address the question of how climate change might have influenced the impact of weather-related disasters. This relation is not straightforward, since disaster burden is not influenced by weather and climate events alone—other drivers are growth in population and wealth, and changes in vulnerability. We normalized disaster impacts, analyzed trends in the data and compared them with trends in extreme weather and climate events and vulnerability, following a 3 by 4 by 3 set-up, with three disaster burden categories, four regions and three extreme weather event categories. The trends in normalized disaster impacts show large differences between regions and weather event categories. Despite these variations, our overall conclusion is that the increasing exposure of people and economic assets is the major cause of increasing trends in disaster impacts. This holds for long-term trends in economic losses as well as the number of people affected. We also found similar, though more qualitative, results for the number of people killed; in all three cases, the role played by climate change cannot be excluded. Furthermore, we found that trends in historic vulnerability tend to be stable over time, despite adaptation measures taken by countries. Based on these findings, we derived disaster impact projections for the coming decades. We argue that projections beyond 2030 are too uncertain, not only due to unknown changes in vulnerability, but also due to increasing non-stationarities in normalization relations.
KeywordsOECD Country Extreme Weather Event Hydrological Event Meteorological Event Disaster Loss
Weather-related disasters such as floods, storms, heatwaves and droughts can have enormous implications for health, the environment and economic development. Historic examples of severe disaster impacts are (1) the drought in Ethiopia and Sudan that resulted in over 400,000 deaths through famine in 1983, (2) the drought in India and floods in China that affected 450 million people in 2002, and (3) Hurricane Katrina and subsequent flooding in the US that led to economic damage valued at 140 billion USD2010.
In the media and among the general public, links between individual disasters and climate change are quickly made. Such connections seem logical, since weather extremes are the drivers of disaster impacts, and the global climate is changing (IPCC 2013); however, connections between disasters and climate change are often made too readily. Often overlooked is the fact that disaster burden is not only steered by weather extremes and changes in their intensity and frequency. Other influencing factors are socioeconomic in nature such as changes in wealth, population and vulnerability over the same period of time (IPCC-SREX 2012, see their figure 1-1; IPCC 2014, see their figure SPM.1).
With regard to economic losses, it has been found that historic trends in D t′ follow a stabilized, constant pattern, both at national and regional scales. Bouwer (2011a) summarizes normalized curves from 22 disaster loss studies and concludes that these studies show no trends in losses when corrected for changes (increases) in population and capital at risk. Global- and continental-scale studies carried out by Neumayer and Barthel (2011) find no significant upward trends in normalized disaster damage over the 1980–2009 period—not globally, regionally, for specific disasters or for specific disasters in specific regions. However, they note that as long as the vulnerability term V t in Eq. (1) is unknown, the role of climate change in disaster losses cannot be ruled out. This latter point has also been discussed by Nicholls (2011) and Bouwer (2011b) in a commentary on Bouwer (2011a).
Nicholls argues that only if improvements in weather forecasting and changes in building regulations and techniques have failed to reduce economic vulnerability to weather hazards can the conclusion be drawn that the absence of an increase in normalized economic losses is evidence that climate change has not increased losses from such hazards. Bouwer (2011b) replies that only a few quantifications of the avoided losses resulting from vulnerability reduction are available. Furthermore, a human contribution to trends in most of the large-scale weather-related hazards that were addressed in his study such as extratropical storms and floods, has not been found. These two arguments underpin the conclusion that changes in population and wealth are the main drivers of increasing impacts of weather-related disasters—the term E t in Eq. (1).
Since weather-related disasters have high societal consequences, the ‘Nicholls-Bouwer discussion’ is of high importance and requires further elaboration. In this article, we follow the lines of the analyses given in Bouwer (2011a) and Neumayer and Barthel (2011) and the subsequent discussion in more detail by extending their approach to impacts other than economic losses, namely the number of people affected and the number of people killed. These latter two indicators are underexposed in the literature. Furthermore, we analyze normalized disaster impacts at large regional scales: globally, in developed countries (OECD countries), in upcoming economies (the group of BRIICS countries) and in developing countries (the remaining countries). Finally, we analyze what type of weather extremes or weather phenomena that contribute most to normalized disaster impacts and summarize what we know about trends in these extremes or phenomena—the term C t in Eq. (1). Trends in vulnerability are also discussed (the term V t in Eq. 1). As in the ‘Nicholls-Bouwer discussion’, we evaluate whether trends in normalized disaster impacts are consistent with trends in climate drivers and vulnerability.
This article is organized as follows: data and methods are given in Section 2, where we also describe the CRED database and provide methodological aspects (normalization procedure and trend estimation). We present the normalization results for three disaster burden indicators in Section 3, and evaluate which type of weather extremes contribute most to these normalized series in Section 4. In Section 5, we evaluate whether trends in normalized disaster burden are consistent with trends in climate drivers and vulnerability. Implications for future projections are discussed in Section 6 and conclusions are given in Section 7. Details on the CRED disaster database and the statistical approach used for trend estimation are given in the electronic supplementary material (ESM).
2 Data and methods
2.1 EM-DAT emergency database
Meteorological events, including hurricanes (typhoons), extratropical storms and local storms
Hydrological events, including coastal and fluvial floods, flash floods and mass movements
Climatological events, including cold waves, heatwaves, other extreme temperature events, drought and wildfire
We have adopted this terminology in this article (although it is rather arbitrary why a storm is denoted as a meteorological event and a heatwave as a climatological event). It should be noted that the term ‘natural disasters’ is used in the literature if geophysical events are also included (earthquakes, tsunamis and volcano eruptions). These latter events are excluded here.
The EM-DAT database provides three disaster impact indicators for each disaster event: economic losses, the number of people affected and the number of people killed. Here, economic losses are direct damage costs and a direct consequence of weather or climate events. The number of people affected is the sum of people injured, people needing immediate assistance for shelter and people requiring immediate assistance during a period of emergency (this may include displaced or evacuated people; see ESM for more detailed definitions).
In Section 3 we analyze the trends in L j,t′, A j,t′ and K j,t′; the relative role of meteorological, hydrological and climatological events are given in Section 4. Normalization can be performed in various ways. Using Eqs. (3a)–(3c), we followed the method proposed by Neumayer and Barthel (2011), see their equation 4. Other functional methods are given by Pielke et al. (2008) and Neumayer and Barthel (2011, see their equation 1). Once a functional method has been chosen, the relations given in Eq. (4) can be calculated on much smaller spatial scales and summed afterwards to the region of interest. Neumayer and Barthel applied this approach for economic losses by defining gridded affected areas with corresponding GDP data. This approach is not followed in this study.
2.3 Trend estimation
There are many methods for estimating trends in historic data (Chandler and Scott 2011; Visser and Petersen 2012); however, generally speaking, there is no best method as this depends on the characteristics selected. We have chosen here to apply a model from the class of structural time series models, in combination with the Kalman filter: the integrated random walk (IRW). The advantage of this model is its ability to generate uncertainties for trend statistics. More specifically, this trend approach generates uncertainties for trend estimates μ t and any trend difference (μ t − μ s). Furthermore, the OLS linear trend, often applied in disaster research, is a special case of the IRW trend approach. The IRW trend can therefore be seen as a natural extension of the straight line, in which the full uncertainty information is retained (Visser 2004; see Appendix B of ESM for details). The importance of choosing a particular trend method in disaster research has been illustrated by Visser and Petersen (2012, their figure 7a and b).
An example for the number of people affected in BRIICS countries is given in Fig. 2. Since the data are skewed to higher values, we log-transformed the original data y t: z t = log (y t). After trend estimation, the trend estimates were back-transformed by taking exponentials (Appendix B of ESM). One consequence of the transformation is that any trend difference (μ t – μ s) estimated for z t, transforms to a trend ratio (μ t/μ s) for y t. The upper panel shows the normalized data along with the IRW trend estimate and 95 % confidence limits. The lower panel shows trend ratios (μ 2010/μ t), along with 95 % confidence limits. This panel shows three important findings: (1) the trend ratio over the full sample period is high: (μ 2010/μ 1980) = 5.2, (2) the 95 % confidence limits are wide: (1.5–18.7), and (3) the rise in the trend occurs mainly over the first 5 years: the trend ratios (μ 2010/μ t) are significant for the 1981–1985 period only (α = 0.05)2.
3 Trends in normalized disaster burden
3.1 Economic losses L j,t′
We estimated trends and uncertainties for normalized economic losses L j,t′ as described in Section 2.3. Data and IRW trends are given in Fig. 3 (upper panel) for all four regions j: Global, OECD, BRIICS and RoW. Due to outliers in the data, we log-transformed all data prior to estimating IRW trends. The trends shown were back-transformed by taking exponentials as explained in Section 2.3. All four trends show a stabilized, constant pattern. As an example, we give the trend ratios (μ 2010/μ 1980): 1.5 (0.7–3.0) for the global trend, with a 95 % confidence limit between brackets, 2.0 (0.8–5.1) for OECD countries, 1.6 (0.6–4.4) for BRIICS countries and 0.66 (0.31–1.4) for RoW countries. None of these trend ratios are therefore statistically different from 1.0; in other words, there was no significant change over the full sample period (1980–2010; α = 0.05)3.
3.2 Number of people affected A j,t′
Data and IRW trends for the normalized number of people affected A j,t′ are shown in Fig. 3 (lower panel). As for the L j,t′ data, we log-transformed prior to estimating IRW trends, compensating for skewness in the data. There appears to be no significant trend for two of the four regions (α = 0.05)4: global and RoW countries (black and blue lines). Examples are the ratios (μ 2010/μ 1980), which are 2.6 (0.9–7.3) for the global trend and 0.80 (0.30–2.11) for the RoW countries.
Trend ratios for OECD and BRIICS also stabilize, but not from 1980 onwards. The situation in BRIICS countries is shown in Fig. 2. As can be seen, the trend stabilizes from 1985 onwards. Similarly, the trend for OECD countries stabilizes from 1982 onwards. The ratios (μ 2010/μ 1980) are 13.8 (1.7–112) for OECD countries and 5.2 (1.5–18.7) for BRIICS countries. We note that the OECD ratio of 13.8 is very high; however, not in terms of absolute numbers. The trend value μ 2010 for BRIICS countries is 0.040, and 0.002 for OECD countries (thus a factor of 20 lower).
3.3 Number of people killed K j,t′
Data and trends for the normalized number of people killed K j,t′ are shown in Fig. 4 (upper panel). The trends were not estimated using IRW trends, as with L j,t′ and A j,t′, as none of the IRW trends estimated for these four regional datasets yielded acceptable white noise innovation data (this whiteness of noise process is a prerequisite for the time series models to hold). This failure is explained by the presence of outliers in these datasets, as can be seen in the lower panel of Fig. 4. We also applied a Gumble and a GEV distribution to the data (constant means). Again, we found no satisfactory results (method shown in Visser and Petersen 2012, their figure 4), and for none of the cases could a satisfactory Kolmogorov-Smirnov test statistic be found (α = 0.05).
3.4 Overall conclusion
Our overall conclusion from Figs. 3 and 4 is that normalized trends generally show stabilized, constant patterns, although some differences exist across the disaster impact indicators L j,t′, A j,t′ and K j,t′. With regard to economic losses, these results are consistent with those reported by Bouwer (2011a) for studies at the national level. Neumayer and Barthel (2011), reporting at the continental and global scales, also found stabilized losses (their figures 4 and 5, upper panels).
4 The relative contribution of weather events and phenomena
The normalized disaster impact indicators treated in Section 3 were aggregated for all types of weather extremes and phenomena. In the context of the ‘Bouwer-Nicholls discussion’ it is important to know the relative contribution of the various weather categories since trends in these have been studied in great detail (see Section 5). Here, we have aggregated weather events in three CRED categories: meteorological, hydrological and climatological events.
Clearly, the terms α j,Met, α j,Hyd and α j, Cli add up to 100 %. Analogous to Eqs. (5a)–(5c), the α terms can be calculated for the number of people affected and the number of people killed. Using the standard errors of each of the terms L j,Met,t′, L j,Hyd,t′ and L j, Cli t′, uncertainties can be calculated for each α using the bootstrap technique (Efron 1982; details not given here).
Contribution of specific types of weather extremes to the total of normalized disaster impact indicators, following Eqs. (5a)–(5c). The top panel is for economic losses, the middle panel for the number of people affected and the lower panel for the number of people killed. All data have been averaged over the 1980–2010 period and all columns sum to 100 % . Percentages between brackets are 68 confidence limits (based on 16 and 84 percentiles)
4.1 Economic losses L j,t′
The upper panel of Table 1 shows a number of important differences across regions and weather categories. Firstly, climatological events have only a limited influence on economic losses L t′: at the most they account for 17 %. Secondly, losses in OECD countries are dominated by meteorological events (64 %), which is not the case in BRIICS countries, where hydrological events dominate (66 %). Thirdly, meteorological and hydrological events are of equal weight (43 and 45 % respectively) for the RoW countries. Finally, meteorological events dominate at the global scale (50 %). We note that the uncertainties in these percentages do not influence the inferences made previously (16 and 84 percentiles given in Table 1).
4.2 Number of people affected A j,t′
The middle panel of Table 1 shows a pattern quite different from that shown in the upper panel. For all four regions, the contribution from floods is most pronounced. Percentages range from 43 % (OECD countries) to 65 % (BRIICS countries). Meteorological events have some effect on disasters in OECD and RoW countries: 36 and 30 % respectively. However, their influence in BRIICS countries and globally is small: 8 and 12 % respectively. The influence of climatological events is rather limited, ranging from 14 % (RoW countries) to 27 % (BRIICS countries).
4.3 Number of people killed K j,t′
The lower panel of Table 1 shows that the percentages differ from those in the upper and middle panels. With regard to the number of people killed, climatological events dominate in three of the four regions: 84, 64 and 60 % for OECD, RoW and global data respectively. The exception is the BRIICS countries. Here, the contribution is 35 %, which is lower than the influence of hydrological events (48 %), although uncertainties are wide in these two estimates.
5 Are trends consistent?
In the preceding sections, we estimated trends in normalized disaster indicators and analyzed the relative contribution of varying weather categories. Here, we return to the ‘Bouwer-Nicholls discussion’ described in Section 1: are the stabilized, constant patterns in normalized disaster burden indicators as shown in Figs. 3 and 4 consistent with trends in climate drivers and vulnerability (the terms C t and V t in Eq. 1)? As stated by Nicholls (2011), three situations could exist: (1) C t is increasing and V t decreasing, (2) C t is decreasing and V t increasing, or (3) both C t and V t show stabilized patterns over the sample period.
5.1 Climate drivers
Historic trend estimates for weather and climate variables and phenomena are presented in IPCC-SREX (2012, see their table 3-1). The categories ‘winds’, ‘tropical cyclones’ and ‘extratropical cyclones’ coincide with the ‘meteorological events’ category in the CRED database. In the same way, the ‘floods’ category coincides with the CRED ‘hydrological events’ category. The IPCC trend estimates hold for large spatial scales (trends for smaller regions or individual countries could be quite different).
The IPCC table shows that little evidence is found for historic trends in meteorological and hydrological events. Furthermore, Table 1 shows that these two events are the main drivers for (1) economic losses (all regions), (2) the number of people affected (all regions) and (3) the number of people killed (BRIICS countries only). Thus, trends in normalized data and climate drivers are consistent across these impact indicators and regions.
The IPCC categories ‘temperature’ and ‘droughts’ coincide with ‘climatological events’. With regard to extreme temperatures, IPCC-SREX concludes that the number of hot extremes has increased since the 1950s, leading to an increase in fatalities; however, the number of cold extremes has decreased, leading to a decrease in fatalities. Furthermore, historic trends in the severity of droughts are unclear, although some regions have experienced more intense and longer droughts, in particular southern Europe and West Africa. Additionally, a more recent study by Sheffield et al. (2012) reports little change in global drought over the past 60 years.
It is difficult to say if, and how, these three different patterns ‘cancel’ each other out over large spatial scales. A positive trend in climatological events can not therefore be ruled out, which applies to those regions where climatological events play a dominant role (cf. lower panel of Table 1, the number of people killed in OECD countries, RoW countries and globally). The difficulty with estimating trends in K j,t′ adds to that conclusion (cf. Figure 4).
We note that the IPCC-SREX conclusions on weather and climate extremes largely coincide with those drawn in IPCC (2007), except for tropical cyclones and droughts (Nicholls and Seneviratne 2013). For these events, the IPCC-SREX conclusions are more cautious; the same holds for conclusions drawn in IPCC (2013–see their sections 184.108.40.206, 2.6.3 and 2.6.4).
As a direct consequence of the findings above, the third situation—both C t and V t show stabilized patterns over the sample period—should hold. In other words, this analysis shows that historic vulnerability is expected to be stable (constant) over the period of analysis. This conclusion is consistent with the reasoning of Bouwer (2011a); however, Nicholls points to a number of factors which should contribute to reductions in vulnerability, notably improvements in early warning systems (extreme weather forecasts) and improvements in building techniques. How can the constant vulnerability patterns therefore be explained?
This question is difficult to answer since quantitative information on vulnerability and vulnerability changes is sparse. Aon (2012) and BEH (2012) presented global vulnerability maps (the WorldRiskIndex), and Cutter et al. (2003) derived a social vulnerability index for the United States, but this did not include time-dependency. IPCC-SREX (2012, box 2-3) discussed vulnerability indices for the Americas, but these estimates are also static, and Preston et al. (2011) and Birkmann (2013) gave extensive reviews of vulnerability mapping.
Two recent developments in this field are however particularly worth mentioning. Preston (2013) presented an index for potential socio-economic exposure (PSE) that encompasses aspects of vulnerability. The PSE index is a function of both population and GDP changes and was derived for individual US counties. Also, Birkmann et al. (2014) presented ‘socioeconomic pathways’ (SSPs), which were derived for future developments in vulnerability but do not provide historic hindcasts.
More qualitatively, we give four explanations for the seemingly contradictory results found here, that of stabilized vulnerability patterns versus ongoing adaptation measures in many countries and regions (Adger et al. 2007, see their table 17.1; Nicholls 2011; Preston 2013, see their section 4; IPCC 2014). Firstly, global disaster management initiatives have only recently been put in place. The Hyogo Framework for Action (HFA) was adopted by 168 Member States of the United Nations in 2005 to take action to reduce vulnerabilities and risks to disasters (UNISDR, 2011). Although these highly important efforts will certainly pay off in the near future, it is unclear whether they are reflected in the sample period chosen for this study. Similar conclusions are drawn in IPCC (2014). The section on adaptation experience (SPM, A.2) sums up a number of adaptation examples across regions, but also states that ‘adaptation is becoming embedded in some planning processes, with more limited implementation of responses (high confidence)’.
Secondly, it is unclear to what extent adaptation measures work in practice. Heffernan (2012) argues that many countries, and even the richest, are ill-prepared for weather extremes. As an example, he names Hurricane Sandy, which wreaked a loss of 50 billion USD along the northeast coast of the US in 2012. As for early warning systems, Heffernan states that not all systems are functioning well. For example, in 2000, Mozambique was hit by a flood worse than any in its history, and the event was not at all anticipated. Warnings of above-average rainfall came too late and failed to convey the magnitude of the coming flood.
Thirdly, a positive trend in vulnerability may be offset by the increasing number of people moving from rural to urban environments, often situated in at-risk areas (UN 2012). Since many large cities lie along coastlines, these movements will make people more vulnerable to land-falling hurricanes (Pielke et al. 2008), coastal flooding and heatwaves (due the urban heat island effect). With regard to economic losses, Hallegatte (2011) argues that these migration movements may have caused disaster losses to grow faster than wealth.
Fourthly, it is unclear how political tensions and violent conflicts have evolved over large regional scales since 1980. On the one hand, Theisen et al. (2013) show that the number of armed conflicts and the number of battle deaths have decreased slightly at the global scale since 1980. On the other hand, these methods are rather crude as far as covering all aspects of political tensions are concerned (Leaning and Guha-Sapir et al. 2013).
We conclude that quantitative information on time-varying vulnerability patterns is lacking. More qualitatively, we judge that a stable vulnerability V t, as derived in this study, is not in contrast with estimates in the literature.
6 Future disaster impacts
Growth in GDP: 140 % in OECD countries, 520 % in BRIICS countries and 410 % in RoW countries
Population growth: an increase of 10 (−3, 23)% in OECD countries, 17 (6, 34)% in BRIICS countries and 65 (30, 80)% in RoW countries—medium, low and high variants taken from UN (2009)
Clearly, these projections are hampered by uncertainties in C t and V t, although projections for meteorological and hydrological events up to 2100 tend to be stable (IPCC-SREX, 2012, see their table 3-1). The term V t is the ‘great unknown’ here (arguments similar to those given in Section 5), and the emerging relation between climate change, economic growth and violent conflicts will make predictions even more difficult (Bergholt and Lujala 2013; Solow 2013; IPCC 2014, SPM, B.2).
We therefore believe that disaster impact projections can be given for the short term only (up to the year 2030). For this 20-year time horizon, increases in economic losses become 70 % for OECD countries, 260 % for BRIICS countries and 210 % for RoW countries. Projections for the number of people affected and the number of people killed show an increase of 5 (−1, 12)% for OECD countries, 8 (3, 17)% for BRIICS countries and 33 (15, 40)% for RoW countries.
We note that Preston (2013) follows a slightly different approach using economic loss data for counties in the United States, as described in Section 5. He presents losses on a county scale for the years 2025 and 2050, while assuming climate to be stable over time.
7 Summary and conclusions
We analyzed disaster impact data in a 3 by 4 by 3 framework based on the CRED EM-DAT database: (1) three disaster impact indicators: economic losses, the number of people affected and the number of people killed, (2) four regions: global, OECD countries, BRIICS countries and remaining countries, and (3) three categories of extreme weather and climate events: meteorological, hydrological and climatological events. Our analysis consisted of data normalization by correcting for changes in wealth (taken as GDP) and population. Trends in these normalized data were compared with trends in the drivers of disaster burden, which are extreme weather events and phenomena, and vulnerability.
Trends in normalized data show constant, stabilized patterns in most cases (Figs. 2, 3 and 4), a result consistent with findings reported in Bouwer (2011a) and references therein, Neumayer and Barthel (2011) and IPCC-SREX (2012).
The role of weather-related drivers varies strongly over economic regions and disaster burden indicators (Table 1). For normalized economic losses, the main drivers are meteorological and hydrological events, whereas climatological events play a minor role. For normalized numbers of people affected, hydrological events are dominant in all regions. For the number of people killed, climatological events are dominant.
The absence of trends in normalized disaster burden indicators appears to be largely consistent with the absence of trends in extreme weather events. This conclusion is more qualitative for the number of people killed. As a consequence, vulnerability is also largely stable over the period of analysis. Possible explanations have been discussed.
We used the findings for historic data to project disaster impacts for the coming decades. A projection for economic losses over the 2010–2030 period yields an increase of 70 % in OECD countries, 260 % in BRIICS countries and 210 % in RoW (Rest of World) countries. Projections for both the number of people affected and the number of people killed show an increase of 5 (−1, 12)% in OECD countries, 8 (3, 17)% in BRIICS countries and 33 (15, 40)% in RoW countries.
We followed the definitions given in IPCC-SREX (2012). The vulnerability of countries or regions is defined as their susceptibility or predisposition to loss and damage to human beings and livelihoods. Vulnerability will decrease due to disaster risk reduction measures (adaptation) but increase if political instabilities occur (riots, civil war, etc.). Note: Birkmann (2013, see Chap. 23) gives 39 definitions of vulnerability.
With ‘significance at α = 0.05’, the following two-sided test is performed: H 0: (μ 2010/μ t) = 1.0 versus H 1: (μ 2010/μ t) ≠ 1.0. In this example, the null hypothesis is rejected for all ratios with ‘t’ between 1980 and 1985, and accepted otherwise.
We would like to thank Bert de Vries (University of Utrecht, the Netherlands), Laurens Bouwer (Deltares, the Netherlands) and two anonymous reviewers for helpful comments on the manuscript. The Centre for Research on the Epidemiology of Disasters (CRED) of the Université Catholique de Louvain is thanked for making available the EM-DAT database (www.emdat.be).
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