5. Diversity is essential for resilience to thrive

Why diversity matters for resilience

Resilience emerges from the interplay of different types of diversity. Each plays a distinct but interconnected role in strengthening the capacities of systems to cope, adapt, and transform (see Must-Know #2). Diversity provides options and flexibility: if one pathway is blocked, another can be pursued. This is true in ecosystems, where multiple species perform different roles, and in societies, where varied skills, perspectives, and institutions provide people with ways to respond to challenges. In this sense, diversity acts like an insurance policy, preventing systems from becoming locked into a single, thus highly vulnerable, way of doing things. At the same time, diversity is a source of novelty and innovation. In nature, genetic and species diversity fuel evolution, while in social systems, diverse actors, ideas, knowledge, practices, and cultures spark creativity and enable technological and social innovation. Together, these options and innovations make diversity a cornerstone of resilience. Different approaches can help systems both to persist in the face of shocks and to transform when new futures are needed.

Response diversity and redundancy keep options open

Response diversity describes the fact that different elements respond to shocks in different ways. In fisheries, for example, different species react differently to storms or temperature changes. A diverse fish stock, therefore, can help to stabilise the overall food supply and income for coastal communities. Such response diversity reduces vulnerability and helps communities to cope with uncertainty. Redundancy can also work to strengthen resilience. Having multiple elements that serve similar functions means that if one element is lost, the others can continue to perform the function. Deliberate redundancy and response diversity can work together to ensure that each subsystem has a backup that responds differently to shocks and can thereby maintain key processes. In coral reefs, overlapping roles among grazing fish mean that, if one species is lost due to overfishing, others will still be able to control the presence of algae. In social systems, ensuring people have shared knowledge and similar skills can help to maintain key functions during crises such as war or natural disasters. However, redundancy without complementarity—or when responses are too similar—weakens resilience. For example, excessive redundancy in management organisations can increase administrative costs, create power struggles between departments, and produce conflicting rules. This can slow down decision-making and create bottlenecks in the system.

Resilience requires diversity in many forms

Functional diversity

Resilient systems are those that support different types of activity. For example, resilient agricultural systems use mixed cropping rather than single-crop methods. Growing different types of plant species provides more stable yields and reduces damage from pests and nutrient loss compared to single-crop farming. More broadly, landscapes that combine natural ecosystems with farmland attract more pollinators, mitigate erosion, and sustain ecosystem services.

Capital diversity

Capital diversity is about not putting all of your eggs in one basket. Financial resources and robust infrastructures are important for long-term resilience, but natural and social capital are equally vital (see Box 2). Societies that invest in ecosystems, institutions, health, and education—not just roads, buildings, and technologies—are more resilient overall. Failing to support these interdependencies can lead to environmental degradation, social breakdown, and economic instability.

Social diversity

A variety of social organisations, networks, norms, and practices can help systems deal with different types of problems. Social diversity can enhance people’s ability to cope, adapt, and transform in the face of change. In Ethiopia, traditional burial societies (iddirs) cover funeral costs and strengthen community resilience by providing financial help, emotional support, and mutual aid to families during illness or death. Migration adds to social diversity, bringing new skills, types of knowledge, and connections that make communities more flexible and innovative. When rooted in both local traditions and enriched by new arrivals, social diversity becomes a key ingredient in resilience.

Cognitive diversity

Diverse perspectives, thinking styles, and problem-solving approaches—known as cognitive diversity—are especially valuable in times of uncertainty. Teams with varied cultural backgrounds and worldviews are more creative and better at finding innovative solutions. Groups like these are less likely to follow uniform patterns of thinking and are more likely to explore a wider range of possible solutions. This effect has been shown in universities, businesses, and governments, where diverse teams often outperform more homogeneous ones, even when the latter are highly skilled.

Safeguarding diversity is a necessity

Functional, capital, social, and cognitive diversity work together to create resilient systems. Despite its importance, key elements of diversity are under threat. Biodiversity, in particular, is declining faster than at any time in human history, with serious implications for the Earth’s stability and human well-being. Safeguarding and fostering diversity in all its forms across ecosystems, societies, economies, and institutions is not just an aspiration but a practical necessity for building resilient futures.