Pacific island countries on the front line of climate change
Pacific Island Countries on the front line of Climate Change
Data visualisation by Tianya Hou
Across 22 nations spanning 20% of Earth’s ocean, pacific communities that have thrived for millennia through deep knowledge of land and sea now face unprecedented change. Despite contributing just 0.03% of global emissions, these islands are heavily influenced by the climate change. For 14.2 million people, the sea provides food, connects communities, and shapes cultural identity. Traditional navigation, sustainable fishing practices, and coastal agriculture have sustained these societies for thousands of years. Today, this intricate relationship between people and place faces systematic disruption as warming seas and changing weather patterns rewrite the rules of island life.
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Temperature
There is abundant evidence of climate change in the Pacific Islands region in the past years. The principal observed variable is (ground-surface) temperature.
This color-coded map displays a progression of changing temperature anomalies from 1850 through 2025. Normal temperatures are shown in white. Higher than normal temperatures are shown in red and lower than normal temperatures are shown in blue. Obviously, the global trend is also reflected in Pacific Islands datasets.
This map represents the temperature anomalies among the pacific community in 1850. Island countries show mostly blue for cooler temperatures.
This map represents the temperature anomalies among the pacific community in 2025. Most of island countries show red for a warmer climate.
At current emissions rates, temperatures are expected to rise 1.4-3.7°C in the Pacific Island region for the next 100 years. Pacific island countries will experience compounding vulnerabilities due to their geographic exposure.
why?
Pacific island countries are particularly vulnerable to climate changes due to their reliance on marine resources and the concentration of settlements in coastal regions
The Pacific region is divided into three distinct ethnological and geographical subregions — Melanesia, Micronesia, and Polynesia. Each subregion faces unique climate change vulnerabilities determined by its specific island geomorphology, whether high volcanic landmasses or low-lying coral atolls.
Melanesia: Papua New Guinea, Solomon Islands, Vanuatu, New Caledonia, Fiji
Micronesia: Northern Mariana Islands, Guam, Marshall Islands, Palau, Micronesia (Federated States of), Nauru, Kiribati
Polynesia: Tuvalu, Tokelau, Wallis and Futuna, Samoa, American Samoa, Tonga, Niue, Cook Islands, French Polynesia, Pitcaim Islands
This map shows the proportions of populations living within 10km of the coast. In Polynesia and Micronesia, nearly 100% of the population lives within a few kilometers of the ocean due to the narrow geography of atolls and small volcanic islands. In Melanesia, about 42% of the population lives within 10 km of the coast, which rises to 94% if Papua New Guinea is excluded.
This map shows the proportions of populations living within 5km of near the coast. In Polynesia and Micronesia, nearly all inhabitants live within 5 km of the coast because of small island sizes and uninhabited rugged interiors. On average, 90% of Pacific Islanders live within 5 kilometers of the coast,excluding Papua New Guinea.
A quarter of the total population in Pacific Island Countries and Territories lives within 1 km of the coast, rising to 57% when Papua New Guinea is excluded. In atoll and volcanic island nations like Tuvalu, Tokelau, Marshall Islands and Pitcairn Islands, 100% of the population lives within 1 km of the ocean.
An SOS on sea level rise
Pacific Island countries are exceptionally vulnerable to rising sea levels because a vast majority of their populations and vital infrastructure sit directly on low-lying coastal zones.
This map represents the sea level anomalies among the pacific community in 1993. Island countries show mostly light green for relative low sea level anomalies.
This map represents the sea level anomalies among the pacific community in 2023. Island countries show mostly dark green for relative high sea level anomalies.
As estimated, Pacific Island nations face an irreversible sea level rise of at least 6 inches (15 cm) over the next 30 years.
Low-lying Pacific nations like Tuvalu, Kiribati, and Marshall Islands face severe existential threats from rising sea levels, with projections indicating parts of their territories could be largely uninhabitable or underwater by 2050.
Global context
Climate change is happening and affects all of us. But not every country is truly facing an equal risk from climate change. Not every region will see the same changes in local weather, or be affected by rising sea levels to the same degree. And not every country has the same capability to prepare and protect itself from the dangers it will face.
This plot highlights a sharp inequality between responsibility and impact. All countries were sorted by their vulnerability and readiness to climate change and the size shows the CO2 emission per person in that country where This data is taken from the ND GAIN Country Index, developed at the University of Notre Dame.
Pacific nations rank among the most vulnerable to climate changes and least prepared to cope with them and among those that contributed the least to global emissions.
Sustainable solutions
Pacific island countries are showing strong climate leadership by aligning their Nationally Determined Contributions (NDCs) and national policies with the global target to limit warming to 1.5°C by the end of the century.
Pacific countries have set ambitious renewable energy targets in national commitments under the Paris Agreement. Cook Islands, Niue and Tuvalu have set a goal of 100% renewable energy by 2020, and Fiji, Vanuatu, and Solomon Islands for 100% renewable energy by 2030. However, the actual share of renewable energy in electricity generation indicates that Pacific nations have a long way to go, with most islands having shares below 25%.
Pacific Island communities increasingly integrate local, Indigenous, and traditional knowledge with grassroots programs to drive local adoption of disaster risk reduction (DRR) strategies. So far, Fiji (0.975) and Kiribati (0.925) show strong DRR performance with the score from 0 (worst) to 1 (best) measuring alignment of DRR strategies with the Sendai Framework. In contrast, many Pacific Islands have yet to begin this critical step.
Pacific Island countries may be small, but they are implementing big ideas to tackle climate change. The strategies being implemented today will determine the fate of these island and perhaps the world.
This project was specifically created for Pacific Dataviz Challenge 2026: Climate Change.
Methodology
All the data visualizations were developed using R.
Scrollytelling features were supported by Quarto with Closeread.
Data
The source code is available on GitHub