A new report launched this week by the Intergovernmental Platform on Biodiversity and Ecosystem Services (IPBES) assessed linkages among biodiversity, water, food and health.
The report, also known as the Nexus, offers decision-makers around the world the most ambitious scientific assessment ever undertaken of these complex interconnections.
The report was approved by the 11th session of the IPBES Plenary, made up of representatives of the 147 Governments that are members of IPBES. It is a product of three years of work by 165 leading international experts from 57 countries from all regions of the world.
Prof. Paula Harrison, co-chair of the Assessment said “we have to move decisions and actions beyond single-issue silos to better manage, govern and improve the impact of actions in one nexus element on other elements. Take for example the health challenge of schistosomiasis (also known as bilharzia), a parasitic disease that can cause life-long ill health and which affects more than 200 million people worldwide, especially in Africa. Treated only as a health challenge – usually through medication – the problem often recurs as people are reinfected. An innovative project in rural Senegal took a different approach – reducing water pollution and removing invasive water plants to reduce the habitat for the snails that host the parasitic worms that carry the disease – resulting in a 32% reduction in infections in children, improved access to freshwater and new revenue for the local communities.”
Prof. Pamela McElwee, also a Co-Chair, said “the best way to bridge single issue silos is through integrated and adaptive decision-making. Nexus approaches’ offer policies and actions that are more coherent and coordinated – moving us towards the transformative change needed to meet our development and sustainability goals. ”
The report states that biodiversity – the richness and variety of all life on Earth – is declining at every level from global to local, and across every region. These ongoing declines in nature, largely as a result of human activity, including climate change, have direct and dire impacts on food security and nutrition, water quality and availability, health and wellbeing outcomes, resilience to climate change and almost all of nature’s other contributions to people.
Building on previous IPBES reports, in particular the 2022 Values Assessment Report and the 2019 Global Assessment Report, which identified the most important direct drivers of biodiversity loss, including land- and sea-use change, unsustainable exploitation, invasive alien species and pollution, the Nexus Report further underscores how indirect socioeconomic drivers, such as increasing waste, overconsumption and population growth, intensify the direct drivers – worsening impacts on all parts of the nexus.
The majority of 12 assessed indicators across these indirect drivers – such as GDP, population levels and overall food supply, have all increased or accelerated since 2001.
“Efforts of Governments and other stakeholders have often failed to take into account indirect drivers and their impact on interactions between nexus elements because they remain fragmented, with many institutions working in isolation – often resulting in conflicting objectives, inefficiencies and negative incentives, leading to unintended consequences,” said Prof. Harrison.
The report highlights that more than half of global gross domestic product – more than $50 trillion of annual economic activity around the world – is moderately to highly dependent on nature. “But current decision-making has prioritized short-term financial returns while ignoring costs to nature, and failed to hold actors to account for negative economic pressures on the natural world. It is estimated that the unaccounted-for costs of current approaches to economic activity – reflecting impacts on biodiversity, water, health and climate change, including from food production – are at least $10-25 trillion per year,” said Prof. McElwee.
The existence of such unaccounted-for costs, alongside direct public subsidies to economic activities that have negative impacts on biodiversity (approximately $1.7 trillion per year), enhances private financial incentives to invest in economic activities that cause direct damage to nature (approximately $5.3 trillion per year), in spite of growing evidence of biophysical risks to economic progress and financial stability.
Delaying the action needed to meet policy goals will also increase the costs of delivering it. Delayed action on biodiversity goals, for example, could as much as double costs – also increasing the probability of irreplaceable losses such as species extinctions. Delayed action on climate change adds at least $500 billion per year in additional costs for meeting policy targets.
More than half of the world’s population is living in areas experiencing the highest impacts from declines in biodiversity, water availability and quality and food security, and increases in health risks and negative effects of climate change. These burdens especially affect developing countries, including small island developing states, Indigenous Peoples and local communities, as well as those in vulnerable situations in higher-income countries.
41% of people live in areas that saw extremely strong declines in biodiversity between 2000 and 2010, 9% in areas that have experienced very high health burdens and 5% in areas with high levels of malnutrition.
Some efforts – such as research and innovation, education and environmental regulations – have been partially successful in improving trends across nexus elements, but the report finds these are unlikely to succeed without addressing interlinkages more fully and tackling indirect drivers like trade and consumption. Decision-making that is more inclusive, with a particular focus on equity, can help ensure those most affected are included in solutions, in addition to larger economic and financial reforms.
The report also examines future challenges – assessing 186 different scenarios from 52 separate studies, which project interactions between three or more of the nexus elements, mostly covering the periods up to 2050 and 2100.
A key message from this analysis is that if current “business as usual” trends in direct and indirect drivers of change continue, the outcomes will be extremely poor for biodiversity, water quality and human health – with worsening climate change and increasing challenges to meet global policy goals.
Similarly, a focus on trying to maximize the outcomes for only one part of the nexus in isolation will likely result in negative outcomes for the other nexus elements. For example, a ‘food first’ approach prioritizes food production with positive benefits on nutritional health, arising from unsustainable intensification of production and increased per capita consumption. This has negative impacts on biodiversity, water and climate change. An exclusive focus on climate change can result in negative outcomes for biodiversity and food, reflecting competition for land. Weak environmental regulation, made worse by delays, results in worsening impacts for biodiversity, food, human health and climate change.
Prof Harrison said future scenarios with the widest nexus benefits are those with actions that focus on sustainable production and consumption in combination with conserving and restoring ecosystems, reducing pollution, and mitigating and adapting to climate change.