Future of
Paradise

The ocean is already moving

Climate change is no longer a story about the future. It is already being recorded in the ocean.

Sea-level anomalies show how observed sea levels differ from a reference level over time across the five islands.

As can be seen from the chart, the trajectories are not identical. Some years bring larger departures from the baseline, while the longer-term movement reveals a changing ocean around these island nations.

For low-lying nations like Tuvalu and Kiribati, where the highest point of land can sit just a few meters above the waterline, even a small upward shift is not cosmetic. It's existential.


The first signal of a changing paradise is beneath the surface.

But the ocean isn't the only thing warming...

Beyond the rising sea

The ocean tells only part of the story.

Surface temperature anomalies show how temperatures have shifted relative to a historical baseline.

Year-to-year variability is expected. What matters is the broader pattern: the baseline itself is moving.

Across five Pacific nations, surface temperatures have shifted measurably since 1990 — not a single hot year, but a sustained climb.

For islands surrounded by ocean and dependent on climate-sensitive ecosystems, sustained warming can place additional pressure on the systems that support everyday life.

And rainfall is another signal that is moving in a messier way. Rainfall anomalies show how much wetter or drier each year was compared to the historical baseline, for each island.

The volatility that can be seen in the data, in itself is the risk. Agriculture, freshwater supply and infrastructure are built around expected rainfall patterns. When the swings get wider, "normal" becomes harder to plan around.

Climate risk isn't only about averages — it is also about extremes and uncertainty.

The edge of the island is moving

For islands surrounded by ocean, the coastline is more than scenery. It is where homes, roads, communities, infrastructure and livelihoods meet the sea.

Using satellite-derived shoreline data, each island's coast can be measured for how much it has physically moved — and how much of it is retreating rather than holding steady.

The shoreline data shows that these islands are not experiencing the same coastal change. Kiribati records a strongly negative median shoreline movement and Vanuatu shows a smaller negative median, indicating erosion, while other islands show net shoreline movement in the opposite direction.

But a single island-wide number can hide an important detail: coastlines do not move uniformly. Some stretches can erode while others remain stable or even build outward.

That is why the share of coastline experiencing erosion matters alongside the median rate. Together, these measures tell us not just how fast the shoreline is moving, but how widespread the pressure is.

The question is no longer whether the coast is changing — but how much of it is changing, and where.

More people - Less room for error

Climate risk isn't just physical — it's about who's in the way of it, and whether that number is growing.

Climate signals become human stories when they intersect with people.

Vanuatu's population is growing fastest among the five, at 2.28% annually — meaning more people will be living with these risks in the decades ahead, not fewer.

Population growth changes the scale of potential exposure — more people, homes, infrastructure and essential services may occupy the same limited island space.

But growth is not inherently a vulnerability. It is the context in which climate pressures have to be managed.

The cost of a changing Paradise

The Pacific's islands are more than places to live. They are also destinations.

Tourism isn't just an economic statistic here — for many of these islands, it's the coastline itself that's the product. Beaches, reefs, and shorelines are both the attraction and the thing most directly threatened by the trends in the previous sections.

Tourism can bring employment, income and international connections — making it an important part of the economic landscape.

But total arrivals can be misleading when comparing countries of very different sizes.

Insead we use:
Tourism per capita = $\left(\frac{\mathrm{annual\; tourist\; arrivals}}{\mathrm{population}}\right)\times 100$

The contrast is striking!

This gives us another perspective of how large tourism is relative to the population that supports it.

So, where does the pressure converge?

So far, we've looked at the signals separately:

• Changing ocean
• Changing weather
• Changing Coastlines
• Changing population
• Changing economies

But no single indicator captures the complexity of climate risk completely.

To bring these dimensions together, a custom comparative Climate Risk Index has been developed for the five islands.

This index combines physical, population and economic dimensions into a single relative score.

Higher score = greater combined pressure within this comparison

Vanuatu ranks highest at 69.5. Tuvalu sits lowest at 36.9 — not because it faces no threat, but because its risk concentrates differently, as the next chart shows.

A score is only the beginning

A ranking tells us where the highest combined pressure appears. But a number alone cannot tell us why.

A single number can hide as much as it reveals. This chart breaks each island's score into what's actually driving it

The Climate Risk Index can be unpacked into three dimensions:

• Physical — environmental pressure
• Population — people and demographic exposure
• Economic — economic dependence and potential stakes

Each island has a different combination:

For Tuvalu, physical exposure accounts for the large majority of its risk — a reflection of its low elevation and limited land area, not its economy or population growth.

For Fiji, a larger share of risk comes from economic exposure — tourism-dependent livelihoods sitting on the same coastlines the earlier charts describe.

Two islands can have similar overall risk — but arrive there for very different reasons!