When most people hear "physical risk," they picture a flood map. A heatwave. A storm hitting an asset. Climate risk, in other words. But physical risk is a much wider category, and climate is only one way of looking at it. Understanding the difference is what separates seeing a single hazard from seeing the full surface of exposure. It is also why, at Darwin, we cover all 3 — climate, physical and nature risk are not separate workstreams but the same physical exposure, read through a single, more complete lens.
The mental shortcut that creates the blind spot
Ask a risk team to assess "physical risk" and most will reach for climate data: temperature curves, precipitation trends, flood and wildfire models at asset level. That instinct isn't wrong but it is partial. It is one way of looking at physical risk: the weather-centric way.
A physical risk is simply a risk that materialises physically — a flood, a storm, a drought, a heatwave, a water shortage, an earthquake. The weather view looks at how the hazard itself is changing. What it misses is that, for most of these hazards, nature sits between the hazard and the asset and absorbs part of the blow: wetlands and floodplains soak up floodwater, forests and soils govern how much rain becomes run-off, mangroves blunt storm surge. Nature doesn't make the hazard disappear — there would still be storms and floods in a perfectly healthy world — but it lowers how often it hits and how hard. As that buffering degrades, the same hazard lands harder, and a purely weather-based view never sees it coming.
Climate and nature aren't 2 lists of risks — they're 2 lenses
Here is the shift that matters. "Climate" and "nature" are usually treated as 2 boxes of hazards. They are better understood as 2 ways of assessing the same physical risks.
The climate lens is weather- and temperature-centric. To gauge flood risk it asks a single question: how is rainfall changing? Powerful, but it stops at the hazard.
The nature lens is holistic. It asks that same question and 2 more: how does the degradation of nature change the hazard itself — a degraded watershed regulates rainfall less well — and how does it erode the local protection nature provides, like floodplains and river meanders that used to absorb a surge? Those buffers are ecosystem services — the benefits nature supplies for free, from rainfall regulation to flood protection to pollination. They are exactly what a weather lens cannot see.
Take a flood. A pure climate analysis tracks changing precipitation and little else. A complete analysis adds the 2 nature channels above: a degraded environment both makes the rain heavier (the water cycle is regulated less well) and removes the local defences that used to absorb it. Same flood, far fuller risk picture.
The 2 lenses are not rivals; one contains the other. The climate lens is the weather-only slice of the nature lens — the same relationship as carbon footprint versus nature footprint, where carbon is the narrow, climate-centric view of a company's much wider footprint on nature. Useful, but partial by construction.
The 4 families of ecosystem services
These services fall into 4 broad families. A nature lens reads the degradation of each; a weather lens reads almost none of it. And most of what it surfaces is not "climate" at all — the exposure builds even in a perfectly stable climate, whenever a service is degraded by pollution, over-extraction, land-use change or habitat loss.
Enabling services — air quality, soil condition, water quality, pollination. These are the background conditions that keep production possible. Roughly 75% of the world's leading food crops depend to some degree on animal pollination, a service valued over $200 billion a year (Source: IPBES). A collapse in pollinators — driven by pesticides, habitat loss and disease — directly cuts yields for coffee, cocoa, fruit and nuts. Degraded soils, air quality and water quality hit dependent assets the same way, with no weather event required.
Mitigating services — nature's buffering of hazards. This is the family the weather lens leans on most while seeing it least. As the systems that absorb shocks degrade — wetlands that soak up floods, vegetation that tempers heat and holds slopes and ground moisture — the same acute hazards (floods, storms, heatwaves, wildfires) and chronic ones (drought, shifting rainfall) hit harder, and ground hazards like subsidence and landslide worsen. Clay shrink-swell subsidence alone — soils expanding and contracting and cracking foundations — costs French insurers around €1 billion a year on average, rising to €3.5 billion in 2022, and threatens more than 12 million homes (Source: CCR). The exception that proves the rule: earthquakes and volcanic eruptions are purely geophysical — no ecosystem buffers them, so a nature lens adds nothing there.
Provisioning services — what nature supplies (water, raw materials, food, fibre). Water stress is just one example. When an aquifer is over-extracted or a basin is allocated to too many users, the water simply isn't there. In 2021 TSMC, the world's largest chipmaker, had to truck water into its fabs during Taiwan's worst drought in over half a century — production continuity threatened not by a storm, but by a depleted shared resource (Source: Fortune). Over-extraction and land-use change degrade water provisioning with or without a climate signal.
Cultural services — recreation, tourism, landscape and heritage value. When the natural asset is the product, its degradation is the risk. Coral bleaching erodes reef-tourism economies; thinning snowpack undermines ski resorts. The dependency is on a functioning, attractive ecosystem — and it can be lost to biodiversity decline and pollution, not only to temperature.
Why the distinction is worth getting right
An asset-level climate model captures temperature and precipitation. It does not capture the compounding degradation of the natural systems an asset actually runs on — the upstream catchment, the soils that hold a slope, the floodplain downstream. 2 assets with identical climate-hazard scores can carry very different physical risk once you account for the nature around them.
And the 2 views reinforce each other in a way that strengthens the case, not weakens it. Climate change is not only a hazard the weather lens tracks: it is also one of the 5 direct drivers of nature loss identified by IPBES, alongside land-use change, pollution, over-exploitation and invasive species. So warming both raises the hazard and erodes the buffer: it drives the pollinator decline, the coral bleaching and the deepening water stress that only a nature lens is built to capture (Source: IPBES).
So the point isn't that nature is a different, narrower thing to track instead of climate. It is the opposite. Because the climate view is the weather-only slice of the nature view, assessing physical risk through a nature lens already contains everything a climate lens sees — and adds what it structurally cannot. Same risks. One lens simply sees more of them.
At Darwin, we assess physical risk through that fuller, nature-based lens — mapping the ecosystem services behind each asset and the hazards their degradation amplifies. Book a demo to see it in practice.