Sustainability can be addressed through an independent inquiry into the fundamental issues at hand; at the same time, its interconnection with climate change cannot be ignored. What is more, both sustainability and climate change are part of a wider, existential challenge humanity faces, which I prefer to describe as the Environment Complex Challenge, encompassing biodiversity loss, environmental degradation, and air, water, and soil pollution. While I would prefer to use the fitting term Anthropocene – as the concept offers a comprehensive description of human impact on Earth and is clearly a primary concern in any debate on sustainability and climate change – it is too closely associated with the failed attempt to name a geological epoch in Earth’s history.[1] Though I was never much of a supporter of that undertaking, I always appreciated the comprehensiveness of its focus. Indeed, in the words of Delanty and Mota (2017), the Anthropocene approach highlights the co-existence of natural and social worlds and the deep intertwining of human and other planetary life. After all, sustainability is about the enduring relationship among society, the economy, and the environment, including how society organises its impact on resources and the critical issue of how to organise economic development and growth.
With regard to sustainability, it is worth recalling its basic definition as stated in the Brundtland Report: meeting the development needs of the present without compromising the ability of future generations to meet their own needs (Our Common Future, 1987). The core argument is that we should be mindful of resource use and not consume more of existing resources than can be replaced, so that future generations will have the same opportunity for development. It is also worth recognising that reducing resource use will help mitigate climate change. While the definition in the Brundtland Report represents a general call for conscious behaviour, several more specific ‘calls to action’ can be identified. One with overriding importance is the increasing global water scarcity, a global challenge but with region-specific impacts. A recent United Nations report (Global Water Bankruptcy, 2026) highlights the seriousness of the water shortage that humanity is facing, assessing that humanity is living beyond water sustainability, as most water-related resources (rivers, lakes, aquifers, wetlands, and glaciers) are beyond full recovery; consequently, water-related risks have become systemic. It added that billions of people face water insecurity, and almost three-quarters of the global population live in countries classified as ‘water insecure’. Another serious topic is food security, and, equally worrying, food waste. A recent UN report states that in 2022, 1.05 billion tonnes, close to one-fifth of the available food, was wasted (UNEP Food Waste Index Report, 2024). With it, a considerable amount of resources is lost in growing and transporting the food in the first place, thereby having a strong negative impact on resource sustainability and on the dynamics of climate change. Land use offers another important focus, not least in connection with biodiversity loss.
When we consider these aspects, the inherent interlinkage between sustainability (the misuse and overuse of resources) and the dynamics of climate change needs to be acknowledged. Yet sustainability is also closely aligned with the broader human environmental imprint, which, in turn, links it to core aspects of the Anthropocene discourse (setting aside the earlier call to describe a geological epoch). As such, resource extraction and resource (mis)use are critical aspects that link sustainability to the Anthropocene concept. Such a perception is also supported by a critical discussion within the Anthropocene movements: when exactly humanity started to generate a fundamental and recognisable impact on the earth. Ruddiman et al. (2015) focus far back in human history on the beginning of the agricultural era, while Delanty and Mota (2017) identify the 18th-century Industrial Revolution as the beginning of the Anthropocene. While the selection of each date can be well supported by different perceptions and interpretations, one could still argue that, from the perspective of resource use, the Industrial Revolution may be the more impactful and lasting event. After all, it can also be interpreted as the starting point of capitalism and as a never-ending demand for resources, pursued through a continuous economic growth strategy at all costs. Indeed, it is capitalism, with its relentless push for relentless economic growth and resource overuse, which undermines any long-term sustainable prospect for humanity. This unyielding pressure for continued economic growth also underlies the dynamics of climate change and thus fundamentally contributes to what I describe as the Environmental Complex Challenge.
Returning to the Brundtland definition of sustainability, the primary demand is that humanity, indeed, every individual, must reconsider their use of resources to reduce the individual’s and, in extension, humanity’s environmental impact as much as possible. One may argue this is not only with a view towards future generations, but also with a view to the present. After all, reducing resource overuse will reduce air, water, and soil pollution, contributing to a healthy environment and a healthy life for everyone. It will also be an integral part of mitigating the climate change dynamic and, thus, climate change-related risks. However, one can argue that the list of public-professional references to sustainability exists longer than the list of references to the climate change dynamic, with a line of connected concepts and programs identifiable from the Brundtland Report (1987) to the Rio Declaration and its Agenda 21 (1992) to the Sustainable Development Goals (Agenda 2030). In addition, we could observe influential regional concepts related to sustainability, such as the Factor 4 approach, developed by von Weizsaecker, Lovins, and Lovins (1997), which advocates increasing resource productivity to achieve sustainable development. They emphasise that improving resource efficiency would not only enhance sustainable development by reducing resource overuse but also generate additional wealth. This concept reminds us again of the interlinkage between the environment, the economy, and society. This triangular relationship is a defining one for thinking about sustainability.
Take, for example, climate change as part of the Environment Complex Challenge, of which sustainability is an inherent aspect. While it represents a global challenge, its impact is always local or regional, thereby affecting the individuals living in those areas. Examples include urban heat waves in Europe and South Asia, and widespread changes in rainfall patterns across Asia, which generate extensive negative impacts on vast rural communities that can last for years. Indeed, extreme weather events are becoming increasingly the norm and increasingly impactful. An estimation of the increasing costs associated with extreme weather events is provided by the World Economic Forum. While during the 1970-1979 decade, associated costs were USD 183.9 billion, they rose to USD 906.4 billion in the 1990-1999 decade, and to USD 1.5 trillion during the 2010-2019 decade (Charlton, 2023). Certainly, responding to extreme weather events by rebuilding and protecting is resource-intensive and therefore a challenge to sustainability in the long run or short run, depending on local circumstances. The threat of sea-level rise, again a global challenge with different local and regional implications, provides another good example. One just has to think about the various Asian megacities, from India to China, that are exposed to sea level rise. Or the threat of sea level rise to food security, when considering the potential devastating impact on the Mekong Delta, the ‘rice bowl’ of Vietnam. While localities and communities around the world are affected by climate change, some face a more severe challenge. We may take the case of Bangladesh, where rising sea levels may submerge wide parts of the country. Where will the people go? They will not stay to drown. As a consequence, tens of millions of climate refugees may move towards West Bengal, in India, and will not be stopped by security measures, when the alternative is drowning. Reducing resource use or increasing the productivity of its use will provide strong support for mitigating climate change by slowing the rate of CO2 increase. Once again, these factors highlight the linkages within the Environmental Complex Challenge and the role of sustainability within it.

At the same time, humanity still faces a fundamental challenge: widespread underdevelopment. One approach to addressing this challenge was the establishment of Agenda 2030, with the aim of ending poverty and hunger in all their forms and dimensions. The sustainable use of resources and protection from environmental degradation are two of the stated goals. Acknowledging the challenges facing the majority of the human population, 17 goals with 169 associated targets were identified (UN Resolution, 2015). What is more, the 2030 Agenda also underscores the interlinkages between development and the climate change challenge. Not only can climate change undermine some of the success already achieved in addressing underdevelopment, but it also increases the challenge of achieving some of the 2030 Agenda goals. Fuso Nerini et al. (2019) assert that 16 of the 17 SDGs and 40 per cent of all targets are impacted by climate change. The climate change challenge to sustainable development is increasing, since we are failing to arrest the climate change dynamic. A recent assessment indicates that we can no longer remain below a 2°C increase, let alone the 1.5°C enhanced climate target agreed in the Paris Agreement. Instead, the predictions made in the last couple of years state that we will be reaching 2.7°C warming by the end of the century (Climate Action Tracker, 2024: 1).
The Environment Complex Challenge highlights and supports another discussion, one related to reconsidering the object of security. While this topic is linked with the late-1980s to mid-1990s debate on the meaning and interpretation of security, by replacing the state as the object of security with a focus on the individual, the relevance of these challenges is as powerful as it was back then, considering the fundamental challenges humanity is facing; unsustainable use of resources, climate change dynamic, biodiversity loss, widespread pollution issues, and environmental destruction. Lipschutz (1995) states that individual security offers a broader recognition of the insecurity people face by including human welfare issues and underdevelopment. Similarly, Smith (2005) argues that security should focus on the real conditions of insecurity that people and collectives are facing. Such a strong focus on the individual, while the role of neither central nor regional governments should be ignored when addressing the sustainability and climate change challenge, is further justified because sustainable development and addressing climate change require a change of behaviour at the individual level. Otherwise, change will not happen. Indeed, it is our responsibility to bring about change and address the fundamental challenge to our future.
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[1] In early March 2024, the International Union of Geological Sciences confirmed the dismissal of recognition of the Anthropocene as a description of a new geological time.



















Likewise, the rich world’s promises of green technology transfer have become mere lip service. Developed-country governments allowed domestic companies to cling to intellectual-property rights that block the spread of critical knowledge for climate mitigation and adaptation. When countries like China and India have sought to encourage their own renewable-energy industries, the US, in particular, has filed complaints with the World Trade Organization.
This short-sighted strategy ultimately benefits no one, including the firms whose immediate financial interests it serves, because it accelerates the planet’s destruction and the revenge of nature on what now appears to be terminally stupid humanity. The student and activist marches in Glasgow against this myopic approach are important but are nowhere near enough to force governments to change course.
The problem is that powerful corporate interests are clearly intertwined with political leadership. People around the world, and especially in the Global North, must become much more vociferous in insisting on meaningful climate action and a real change in economic strategy that resonates beyond national borders. Only that can end the rich world’s green hypocrisy and save us all.