By Tim Radford
Ethnic conflict linked to tragic episodes of civil war, waves of refugees and even the collapse of nation states could be made more likely by climate-related disasters.
A team of European scientists say they can demonstrate, "in a scientifically sound way," a link between civil violence based on ethnic divisions and episodes of drought, intense heat or other climate-linked weather extremes.
Syrian refugee camp.
That climate change seems to be a factor in social collapse is now fairly firmly established. Researchers have identified evidence of prolonged drought that preceded the collapse of Assyrian and Bronze Age civilizations in prehistory.
There have also been repeated warnings that, without concerted international action, global temperatures driven by rising greenhouse gas emissions could rise to make life almost intolerable in regions already increasingly insecure.
The latest finding carries lessons for a planet that has yet to confront the demands of climate change.
Researchers who looked at the patterns of political disturbance and climate-related events weren't especially concerned with climate change: They were looking for connections. And they found one: a demonstrable probability that inter-ethnic divisions could be brought to flashpoint by extended periods of drought.
They report in the Proceedings of the National Academy of Sciences that in the study period of 1980 to 2010, almost a quarter of all armed conflict in ethnically-divided societies could be connected to extremes of heat or drought.
"Although we do not report evidence that climate-related disasters act as direct triggers of armed conflicts, the disruptive nature of these events seems to play out in ethnically-fractionalized societies in a particularly tragic way," they concluded.
"This observation has important implications for future security policies as several of the world's most conflict-prone regions—including North and Central Africa, as well as Central Asia—are exceptionally vulnerable to anthropogenic climate change and are characterized by deep ethnic divides."
The scientists matched data from the reinsurance group Munich Re—which for decades has been recording disaster-related economic damage on a national level—with records of armed conflict.
They then used a mathematical method of coincidence event analysis to see whether a pattern emerged. And even without any accounting for climate change, there it was: a connection between ethnic bloodshed and climate calamity.
Study leader Carl-Friedrich Schleussner, scientific adviser at the Berlin think tank Climate Analytics and researcher at the Potsdam Institute for Climate Impact Research (PIK), said: "Climate disasters are not directly triggering conflict outbreak, but may enhance the risk of a conflict breaking out that is rooted in context-specific circumstances. As intuitive as this might seem, we can now show this in a scientifically sound way."
His co-author, Hans Joachim Schellnhuber, director of PIK, said:
"Armed conflicts are among the biggest threats to people, killing some and forcing others to leave their home and maybe flee to far-away countries. Hence, identifying ethnic divide and natural disasters as enhancing destabilization risks is potentially quite relevant.
"Human-made climate change will clearly boost heatwaves and regional droughts. Our observations, combined with what we know about increasing climate-change impacts, can help security policy to focus on risk regions.
"So our study adds evidence of a very special co-benefit of climate stabilization: peace."
Maryland will become the first state in the nation Thursday to implement a ban on foam takeout containers.
- New Jersey Legislature Passes 'Most Comprehensive' Plastics Ban ... ›
- Canada to Announce Ban on Single-Use Plastics - EcoWatch ›
- The Complex and Frustrating Reality of Recycling Plastic - EcoWatch ›
- Dunkin' Says Bye to Foam Cups (But Bring Your Own Thermos ... ›
- Maine and Vermont Pass Plastic Bag Bans on the Same Day ... ›
EcoWatch Daily Newsletter
By Ajit Niranjan
Leaders from across the world have promised to turn environmental degradation around and put nature on the path to recovery within a decade.
- Destruction of Nature Is Triggering Pandemics, Say Leaders of WWF ... ›
- The UN Wants to Protect 30% of the Planet by 2030 - EcoWatch ›
- New WWF Report Calls for Protecting Nature to Prevent Future ... ›
Just days after a new report detailed the "unequivocal and pervasive role" climate change plays in the increased frequency and intensity of wildfires, new fires burned 10,000 acres on Sunday as a "dome" of hot, dry air over Northern California created ideal fire conditions over the weekend.
- California's Iconic Redwoods Threatened by Wildfires - EcoWatch ›
- California Wildfires Destroy Condor Sanctuary, at Least 4 Birds Still ... ›
- 7 Devastating Photos of Wildfires in California, Oregon and ... ›
- David Attenborough Calls For Ban on Deep-Sea Mining - EcoWatch ›
- Sir David Attenborough Set to Present BBC Documentary on ... ›
- David Attenborough Gives Stark Warning in New BBC Climate ... ›
Kevin T. Smiley
When hurricanes and other extreme storms unleash downpours like Tropical Storm Beta has been doing in the South, the floodwater doesn't always stay within the government's flood risk zones.
New research suggests that nearly twice as many properties are at risk from a 100-year flood today than the Federal Emergency Management Agency's flood maps indicate.
Flooding Outside the Zones<p>About <a href="https://furmancenter.org/files/Floodplain_PopulationBrief_12DEC2017.pdf" target="_blank">15 million</a> Americans live in FEMA's current 100-year flood zones. The designation warns them that their properties face a 1% risk of flooding in any given year. They must obtain flood insurance if they want a federally ensured loan – insurance that helps them recover from flooding.</p><p>In Greater Houston, however, <a href="https://doi.org/10.1111/j.1539-6924.2012.01840.x" target="_blank">47% of claims</a> made to FEMA across three decades before Hurricane Harvey were outside of the 100-year flood zones. Harris County, recognizing that FEMA flood maps don't capture the full risk, now <a href="https://www.hcfcd.org/floodinsurance" target="_blank" rel="noopener noreferrer">recommends that every household</a> in Houston and the rest of the county have flood insurance.</p><p>New risk models point to a similar conclusion: Flood risk in these areas outstrips expectations in the current FEMA flood maps.</p><p>One of those models, from the <a href="https://firststreet.org/flood-lab/research/2020-national-flood-risk-assessment-highlights/" target="_blank">First Street Foundation</a>, estimates that the number of properties at risk in a 100-year storm is 1.7 times higher than the FEMA maps suggest. Other <a href="https://doi.org/10.1088/1748-9326/aaac65" target="_blank" rel="noopener noreferrer">researchers</a> find an even higher margin, with 2.6 to 3.1 times more people exposed to serious flooding in a 100-year storm than FEMA estimates.</p>
What FEMA’s Flood Maps Miss<p>Understanding why areas outside the 100-year flood zones are flooding more often than the FEMA maps suggest involves larger social and environmental issues. Three reasons stand out.</p><p>First, some places rely on relatively old FEMA maps that don't account for recent urbanization.</p><p>Urbanization matters because impervious surfaces – think pavement and buildings – are not effective sponges like natural landscapes can be. Moreover, the process for updating floodplain maps is locally variable and can take years to complete. Famously, New York City was updating its maps when Hurricane Sandy hit in 2012 but hadn't finished, meaning flood maps in effect <a href="https://projects.propublica.org/nyc-flood/" target="_blank">were from 1983</a>. FEMA is required to assess whether updates are needed every five years, but the <a href="https://www.fema.gov/cis/nation.html" target="_blank" rel="noopener noreferrer">majority of maps</a> <a href="https://www.oig.dhs.gov/sites/default/files/assets/2017/OIG-17-110-Sep17.pdf" target="_blank" rel="noopener noreferrer">are older</a>.</p><p>Second, binary thinking can lead people to an underaccounting of risk, and that can mean communities fail to take steps that could protect a neighborhood from flooding. The logic goes: if I'm not in the 100-year floodplain, then I'm not at risk. Risk perception <a href="https://doi.org/10.1088/1748-9326/ab195a" target="_blank" rel="noopener noreferrer">research</a> backs this up. FEMA-delineated flood zones are the major factor shaping flood mitigation behaviors.</p><p>Third, the era of climate change scuttles conventional assumptions.</p><p>As the planet warms, extreme storms are becoming <a href="https://nca2018.globalchange.gov/" target="_blank">more common and severe</a>. If greenhouse gas emissions continue to increase at a high rate, computer models suggest that the chances of a severe storm dropping 20 inches of rain on Texas in any given year will increase from about 1% at the end of the last century to 18% at the end of this one, a chance of <a href="https://doi.org/10.1073/pnas.1716222114" target="_blank" rel="noopener noreferrer">once every 5.5 years</a>. So far, <a href="https://www.rstreet.org/wp-content/uploads/2020/02/195.pdf" target="_blank" rel="noopener noreferrer">FEMA hasn't taken into account the impact climate change is having</a> on extreme weather and sea level rise.</p>
Racial Disparities in Flooding Outside the Zones<p>So, who is at risk?</p><p>Years of research and evidence from storms have highlighted social inequalities in areas with a high risk of flooding. But most local governments have less understanding of the social and demographic composition of communities that experience flood impacts outside of flood zones.</p><p>In analyzing the damage from Hurricane Harvey in the Houston area, I found that <a href="https://doi.org/10.1088/1748-9326/aba0fe" target="_blank">Black and Hispanic residents disproportionately experienced flooding</a> in areas beyond FEMA's 100-year flood zones.</p><p>With the majority of flooding from Hurricane Harvey occurring outside of 100-year flood zones, this meant that the overall impact of Harvey was racially unequal too.</p><p>Research into where flooding occurs in Baltimore, Chicago and Phoenix points to some of the potential causes. <a href="https://www.nap.edu/read/25381/chapter/4#16" target="_blank" rel="noopener noreferrer">In Baltimore and Chicago</a>, for example, aging storm and sewer infrastructure, poor construction and insufficient efforts to mitigate flooding are part of the flooding problem in some predominantly Black neighborhoods.</p>
What Can Be Done About It<p>Better accounting for those three reasons could substantively improve risk assessments and help cities prioritize infrastructure improvements and flood mitigation projects in these at-risk neighborhoods.</p><p>For example, First Street Foundation's risk maps account for <a href="https://firststreet.org/flood-lab/research/flood-model-methodology_overview/" target="_blank">climate change</a> and present <a href="https://floodfactor.com/" target="_blank" rel="noopener noreferrer">ratings</a> on a scale from 1 to 10. FEMA, which works with communities to update flood maps, is <a href="https://www.fema.gov/media-library-data/1521054297905-ca85d066dddb84c975b165db653c9049/TMAC_2017_Annual_Report_Final508(v8)_03-12-2018.pdf" target="_blank" rel="noopener noreferrer">exploring rating systems</a>. And the National Academies of Sciences, Engineering and Medicine recently <a href="https://www.nationalacademies.org/news/2019/03/new-report-calls-for-different-approaches-to-predict-and-understand-urban-flooding" target="_blank" rel="noopener noreferrer">called for a new generation of flood maps</a> that takes climate change into account.</p><p>Including recent urbanization in those assessments will matter too, especially in fast-growing cities like Houston, where <a href="https://authors.elsevier.com/a/1boBRyDvMFW6W" target="_blank" rel="noopener noreferrer">386 new square miles</a> of impervious surfaces were created in the last 20 years. That's greater than the land area of New York City. New construction in one area can also <a href="https://scalawagmagazine.org/2018/01/city-in-a-swamp-as-houston-booms-its-flood-problems-are-only-getting-worse/" target="_blank" rel="noopener noreferrer">impact older neighborhoods downhill</a> during a flood, as some Houston communities discovered in Hurricane Harvey.</p><p>Improving risk assessments is needed not just to better prepare communities for major flood events, but also to prevent racial inequalities – in housing and beyond – from <a href="https://www.npr.org/2019/03/05/688786177/how-federal-disaster-money-favors-the-rich" target="_blank" rel="noopener noreferrer">growing</a> after the unequal impacts of disasters.</p>
- Overlooked Flood Risk Endangers Homeowners - EcoWatch ›
- Florida Coastal Flooding Maps: Residents Deny Predicted Risks to ... ›
- Flooding Risk for U.S. Homes: Millions More Are Vulnerable Than ... ›