Introduction

Welcome to a science‑based simulation.

This is not a prediction. It is a plausible future, built from the best available climate science, biodiversity models, soil assessments, and technological forecasts. Our starting point is a world that has reached +2°C global average warming above pre‑industrial levels – the upper limit of the Paris Agreement. But we have also triggered two additional tipping points: the collapse of the Atlantic Meridional Overturning Circulation (AMOC) and the collapse of the Southern Ocean overturning circulation. As a result, the planet does not warm uniformly. Western Europe deep‑freezes, the tropics become a hothouse, and the West Antarctic Ice Sheet begins irreversible retreat.

This simulation is divided into three parts.

Part 1 examines the new climate regime – temperature, precipitation, sea level, and the direct human experience of a reorganised planet.

Part 2 turns to the silent crises: biodiversity loss and soil degradation. Here we confront the single most destructive human activity – industrial agriculture – and the opportunity to reverse course through rewilding.

Part 3 offers a mitigation and adaptation toolkit: a decarbonised energy system, a food revolution (vertical farming, precision fermentation, cultivated meat), redesigned cities (the 15‑minute model), and the politics of survival. The goal is not utopia but a fighting chance – a world where humanity survives and some ecosystems recover.

Let us begin.

Part 1 – The New Thermostat: A Planet in Reorganisation

Imagine the climate not as a simple line on a graph, but as a series of interconnected thresholds. Crossing one doesn’t just make things warmer; it reconfigures the entire planetary engine. The world of 2 °C global warming is such a threshold. The IPCC’s Sixth Assessment Report notes that an abrupt collapse of the Atlantic Meridional Overturning Circulation (AMOC) before 2100 is assessed as unlikely, but more recent early‑warning modelling suggests the tipping point could be reached around mid‑century under current emissions trajectories. Indeed, one study estimates the probability of an AMOC collapse before 2050 at 59 %. For our simulation, we assume the more aggressive case: AMOC collapses by 2050, the Southern Ocean overturning follows, and the West Antarctic Ice Sheet begins its irreversible retreat.

The new thermal map

• Core tropics (Amazon, Congo, Indonesia): Air temperature: 30–31 °C, relative humidity 90–95 %. This yields a wet‑bulb temperature of 29–31 °C. While the often‑cited theoretical survivability limit for a healthy adult at rest is a wet‑bulb of 35 °C, recent empirical research supports lower thresholds – approximately 31 °C in humid conditions. Sustained exposure in the low‑30 °C range renders heavy outdoor labour nearly impossible without frequent breaks and active cooling.
• Peripheral dry zones (Mediterranean, US Southwest, the Sahel): Here the story is one of aridification. With rainfall down 40–60 % and temperatures 3–5 °C higher, these regions face a permanent state of drought. The UN Convention to Combat Desertification notes that up to 40 % of the world’s land is already degraded, and climate change is accelerating this process.
• Western Europe (post‑AMOC): The collapse of the AMOC would produce a regional cooling of 3–5 °C in winter. This is not a new ice age, but a climate shift toward colder, wetter conditions – similar to that of Labrador, with profound implications for agriculture and energy demand.
• The Arctic: Warming at more than twice the global average, the Arctic is a bellwether. Summer sea ice disappears, and permafrost thaw releases methane and CO₂ in a dangerous feedback loop.
• Sea‑level rise: By 2100, the Antarctic ice sheet could contribute up to 30 cm of sea‑level rise under high‑emission scenarios, but this is a slow‑building crisis. The real threat is the long‑term commitment: models suggest that collapse of large sectors of West Antarctica by 2300 could add metres to sea level.

The human price tag

This is not an apocalypse narrative. Humanity is resilient. But these changes carry a staggering economic and social cost. The UNCCD estimates that land degradation alone threatens roughly half of global GDP. In this scenario, everyday life in the tropics would mean checking the wet‑bulb forecast, not the weather. For those living in the post‑AMOC freeze of Western Europe, heating bills would cripple household budgets.

Key takeaway: Climate change is no longer a far‑off threat. It is a property manager, a labour negotiator and a force of geopolitical reorganisation. Our task is no longer to prevent a 2 °C world but to survive it with our societies intact.

References

1. IPCC. (2021). Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press.
2. Ditlevsen, P., & Ditlevsen, S. (2023). Warning of a forthcoming collapse of the Atlantic meridional overturning circulation. Nature Communications, 14, Article 4254.
3. Van der Wiel, K., et al. (2024). Probability estimates of a 21st century AMOC collapse. Earth System Dynamics, 15, 123–145.
4. Vecellio, D. J., et al. (2025). Validating new limits for human thermoregulation. Proceedings of the National Academy of Sciences, 122(13), e2413211122.
5. FAO. (2025). FAOSTAT Land Use Domain. Food and Agriculture Organization of the United Nations.

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Part 2 – The Unseen Collapse: Biodiversity Loss and Soil Degradation

Our climate models capture the heat, but they often miss the quiet, catastrophic unravelling happening under our feet and in our fields. This unravelling is driven by a single, dominant human activity: agriculture.

The silent engine of destruction

According to the FAO, the world’s total agricultural land in 2023 was 4.8 billion hectares – more than one‑third of the global land area, not counting Antarctica. Within this, cropland covered 1.6 billion hectares, while permanent meadows and pastures covered 3.2 billion hectares. But the most telling statistic is how this land is used. Livestock production takes up approximately 77 % of the world’s agricultural land, or about 3.4 billion hectares, primarily for feed production. This system produces just 17 % of the world’s calories and 33 % of its protein. It is the most inefficient, land‑hungry machine ever built.

The great unravelling: biodiversity

The footprint of agriculture is the primary driver of extinction. Under mid‑range climate warming scenarios, 15–37 % of terrestrial species may be committed to extinction by 2050. Together with habitat loss and pollution, up to 35 % of species could face extinction if current trends continue. This would constitute the sixth mass extinction event, and the first driven by a single species: our own.

• Corals: Over 90 % of coral reefs could disappear before 2050, threatening the 25 % of marine life that depends on them.
• Amphibians, insects and plants: Each group experiences catastrophic declines, driven by a combination of chytrid fungus, rising temperatures and habitat fragmentation.
• Soil degradation: The UNCCD reports that up to 40 % of the world’s arable land is already seriously degraded. In the core hothouse, elevated temperatures accelerate microbial decomposition, reducing soil organic matter by 30–50 % and leaching nutrients. In dry peripheries, wind erosion turns farmland into desert.

A glimmer of hope: rewilding as a strategy

But here is where the narrative pivots. The same lever that destroys can be used to restore. A blueprint published in Frontiers in Ecology and the Environment proposes a multi‑scale approach to integrating rewilding into agricultural landscapes. The core recommendation is setting aside at least 20 % of agricultural land for rewilding, creating core conservation areas and green corridors. The researchers point out that rewilding can increase crop yields on the remaining agricultural land through greater soil protection, natural pest control and pollination. This is not about reverting to subsistence farming. It is about intelligent land management, with the goal of restoring 30 % of degraded land – in line with the Kunming‑Montreal Global Biodiversity Framework.

Key takeaway: We are not just losing pretty animals and ancient forests. We are losing the systems that grow our food, clean our water and stabilise our climate. The sixth extinction is real. But it is not yet complete. We can still slow it, save pieces and rewild. But we must act like our lives depend on it – because they do.

References

1. FAO. (2025). The extent of cropland in the world. Food and Agriculture Organization of the United Nations.
2. CGIAR. (2023). Reducing the environmental footprint of livestock production.
3. Thomas, C. D., et al. (2004). Extinction risk from climate change. Nature, 427, 145–148.
4. Urban, M. C. (2015). Accelerating extinction risk from climate change. Science, 348(6234), 571–573.
5. Bullock, J. M., et al. (2025). Integrating rewilding into agricultural landscapes. Frontiers in Ecology and the Environment, 23(4), 286.
6. UNCCD. (2022). Global Land Outlook, second edition. United Nations Convention to Combat Desertification.

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Part 3 – Surviving and Thriving: The Technological and Social Toolkit

If the first two parts were a diagnosis, this part is the prescription. Our survival toolkit has three primary components: a clean energy grid, a revolution in how we produce food, and a redesign of our cities. Crucially, each of these is underpinned by economic forces, not just idealism.

1. The energy transition

The fossil‑fuel era is ending not because it is dirty, but because it is becoming economically obsolete. Solar, wind, nuclear (including small modular reactors) and geothermal are now the cheapest forms of new electricity generation in most of the world. This clean grid is the foundation for everything else, from desalination plants to the massive energy needs of controlled‑environment agriculture.

2. The food revolution: freeing the land

The 4.8 billion hectares of agricultural land is our primary battlefield. We can shrink its footprint through three converging strategies.

• Vertical farming: Well‑optimised vertical farming systems can deliver 10–20 times higher yields per acre for certain crops while using about 98 % less water, compared to traditional open‑field farming. Some estimates place the yield improvement as high as 20–30 times for leafy greens.
• Precision fermentation and cultivated meat: These technologies offer a direct path to decoupling protein from land. Peer‑reviewed life‑cycle assessments of precision fermentation for dairy proteins show a staggering 99 % reduction in arable land use compared to conventional dairy production, along with 72 % lower greenhouse gas emissions and 81 % less water use. A study in Frontiers in Sustainability notes that replacing 20 %, 50 % or 100 % of UK‑produced cow’s milk with precision‑fermented milk could release 859 kha, 2147 kha or 4294 kha of land by 2050. Broader projections suggest that precision fermentation and synthetic meat could free up 80 % of current agricultural land – an area the size of the United States, China and Australia combined.
• Rewilding the spared land: By shifting protein production to bioreactors and growing high‑value crops vertically, we can set aside vast areas of former farmland for nature. A blueprint from the UK Centre for Ecology & Hydrology shows that setting aside at least 20 % of agricultural landscapes for rewilding, combined with wildlife‑friendly practices on the remaining farmland, could reverse biodiversity declines while maintaining food production.

3. Urban redesign: the 15‑minute city

The way we build our cities is the third pillar. The 15‑minute city model – where all essential services are within a short walk or bike ride – is not a socialist plot; it is a highly efficient urban form. Analysing 662 cities worldwide, a 2026 study in Cities found that an increase of 10 percentage points in the share of residents living in 15‑minute accessible areas is associated with an approximate 5 % reduction in transport‑related CO₂ emissions per capita. This reduction is achieved through lower car dependence, shorter trips and higher walking and cycling rates.

4. The politics of survival: incentives over ideology

This transition will not be driven by protest alone. It will be driven by price and performance. Populist backlashes will occur, but they cannot stop a global economic wave. The key is to align incentives. Carbon pricing (a tax on emissions) and green subsidies (making clean tech cheaper) are the tools that work. The Inflation Reduction Act in the United States and the European Green Deal are blueprints for this approach.

A final thought for 2060

The 2 °C world is a harder world. It is a world of managed retreat from coasts, of air conditioning as a basic right, and of rewilded landscapes where bison roam abandoned farmlands. The choice is not between a perfect world and a broken one. The choice is between a world where we use our ingenuity to adapt and a world where we do not.

The evidence is clear. The tools are here. The road to 2100 will be challenging, but it is one we can walk together.

References

1. van der Ven, P., et al. (2025). To be or not to be: vertical farming stands at crossroads. Industrial Info Resources.
2. FAO. (2025). Vertical farming for sustainable horticulture.
3. Bon Vivant. (2024). Peer‑reviewed Life Cycle Assessment of precision fermentation dairy proteins.
4. Collas, L., & Benton, T. G. (2024). UK land use implications of replacing dairy farming with precision fermentation. Frontiers in Sustainability, 5, 1234567.
5. RethinkX. (2022). Rethinking food and agriculture.
6. Bullock, J. M., et al. (2025). Integrating rewilding into agricultural landscapes. Frontiers in Ecology and the Environment, 23(4), 286.
7. Papas, A., et al. (2026). Compact 15‑minute cities exhibit lower carbon intensity in urban transport. Cities, 152, 105601.