For most of human history, the world's islands have appeared on maps roughly where they've always been. But climate change is now actively erasing some islands from the map. Rising sea levels, increased storm intensity, and coastal erosion are submerging low-lying lands at rates that threaten the existence of entire nations.
How Islands Disappear
Islands can disappear for several reasons:
- Sea-level rise: Global average sea levels have risen about 20 cm since 1900 and the rate is accelerating. Higher seas progressively submerge low-lying coastal land.
- Storm surge erosion: Stronger and more frequent tropical cyclones erode coastlines faster than they can regenerate.
- Saltwater intrusion: Higher water tables make freshwater unavailable and farming impossible long before land actually submerges.
- Subsidence: Some islands are sinking due to natural geological processes (especially atolls built on volcanic islands that are slowly cooling and sinking).
- Reduced coral growth: Atolls depend on living coral reefs to keep up with sea-level rise; coral bleaching and acidification slow this regeneration.
Tuvalu
Tuvalu is one of the world's most vulnerable countries. The Pacific island nation consists of nine small islands totaling just 26 km², with about 11,000 residents. The maximum elevation of any point in Tuvalu is about 4.6 m. Most of the country sits less than 2 m above sea level.
Tuvalu has been at the forefront of climate diplomacy for over two decades, frequently making the case for urgent global emissions reductions. The country has filed legal claims demanding that high-emitting countries take responsibility for island nations' losses. In 2022, Tuvalu announced plans to create a "digital twin" of the country in the metaverse — essentially preserving its geography, culture, and statehood digitally even if the physical islands become uninhabitable.
Kiribati
Kiribati is similarly vulnerable. The country consists of 33 atolls spread across 3.5 million km² of the central Pacific Ocean, with a total land area of just 811 km² and population of about 130,000. Most of Kiribati sits less than 2 m above sea level.
In 2014, Kiribati purchased land in Fiji as a potential resettlement option for its citizens. The country has been described as the first nation likely to become uninhabitable due to climate change. The 2015 Paris Agreement specifically referenced the existential threats facing Pacific island states. Kiribati's former president Anote Tong has been a leading global voice on climate justice issues.
The Maldives
The Maldives, an Indian Ocean archipelago of 26 atolls and about 1,200 islands, is the world's lowest-lying country. The average elevation is just 1.5 m above sea level; the highest point is only 5.1 m. About 500,000 Maldivians live across the inhabited islands, with the capital Malé among the most densely populated cities in the world.
The Maldives is actively building artificial islands and seawalls to protect critical infrastructure. The country has invested heavily in raising its main airport (located on a separate island from Malé) and creating a new artificial island called Hulhumalé about 2 m higher than natural land. But the long-term outlook is grim — most experts agree the Maldives cannot be saved from sea-level rise without dramatic and immediate global emissions reductions.
The Marshall Islands
The Marshall Islands consist of about 1,100 islands and atolls in the central Pacific, with a population of about 42,000. Like Tuvalu and Kiribati, the country is overwhelmingly low-lying. The Marshall Islands are also dealing with radioactive contamination from US nuclear tests at Bikini Atoll in the 1940s and 1950s — a complicated additional layer of geographic loss.
Bangladesh's Vanishing Land
While not technically island disappearances, Bangladesh's delta region is losing land to similar processes. The Sundarbans mangrove islands are particularly vulnerable. Bhola Island, once one of the largest Bangladeshi islands, has lost half its area to erosion since the 1960s, displacing about 500,000 people. The country's low elevation and dense population mean climate-related displacement could affect tens of millions.
Carteret Islands
The Carteret Islands of Papua New Guinea are sometimes cited as the location of the world's first complete "climate refugees." The seven small islands have been progressively abandoned since 2005, with residents resettling to nearby Bougainville. The islands' arable land has been destroyed by saltwater intrusion and the islands themselves are shrinking due to erosion. Most residents have now relocated.
Individual Islands Already Lost
Some specific islands have already disappeared or been declared uninhabitable due to sea-level rise and erosion:
- Lohachara Island (Bay of Bengal, 2006) — once home to 10,000 people, now submerged.
- New Moore Island/South Talpatti (Bay of Bengal, 2010) — disputed island between India and Bangladesh, now submerged.
- Five Solomon Islands (Pacific, since 1947) — five reef islands have completely disappeared since aerial photography began.
- Lateu Village, Vanuatu (relocated 2005) — residents moved inland after rising seas reached homes.
Legal and Political Implications
Disappearing islands raise novel legal questions. Some are:
- If an entire country becomes uninhabited or submerged, does it remain a sovereign nation?
- Do island nations retain their UN seats and maritime EEZs after physical disappearance?
- What rights do "climate refugees" have under international law?
- How should high-emitting countries compensate disappearing nations for their losses?
The UN, the International Court of Justice, and various international forums have been wrestling with these questions. In 2023, the UN General Assembly voted to ask the ICJ for an advisory opinion on climate change obligations and rights.
Maritime Boundaries
Disappearing islands also threaten extensive maritime claims. Under the UN Convention on the Law of the Sea, countries have exclusive economic zones (EEZs) extending 200 nautical miles from their coastlines. If islands disappear, the EEZs disappear too — potentially erasing fishing, mining, and other resource rights that countries depend on. Some island nations are filing legal claims to "freeze" their EEZ boundaries at current positions even if physical islands recede.
Adaptation Strategies
Island nations are trying various adaptation strategies, with varying success:
- Seawalls and breakwaters: Common but expensive and often inadequate against sustained rise.
- Land reclamation: The Maldives has built artificial islands; this is expensive but works for limited areas.
- Beach nourishment: Pumping sand onto eroded beaches; temporary and resource-intensive.
- Elevated infrastructure: Raising critical buildings and roads on stilts or earth fills.
- Relocation: Some communities are moving to higher inland areas; others are arranging for resettlement in other countries.
- Digital preservation: Tuvalu's "metaverse" plan is an example.
Why It Matters
The disappearance of inhabited islands is not just an ecological story — it's the first wave of climate-driven displacement at a national scale. As sea-level rise continues, millions of people in low-lying coastal regions worldwide could face similar threats. The legal, political, and humanitarian frameworks being developed for island nations now will shape responses to much larger climate-driven displacement in the decades ahead.
Cultural Heritage at Risk
Beyond the physical land, disappearing islands also threaten unique cultures, languages, and traditional knowledge systems. Many island nations have small populations speaking languages spoken nowhere else. Tuvalu has its own language (Tuvaluan) with about 13,000 speakers worldwide. Kiribati has Gilbertese. Pacific island societies have developed sophisticated knowledge of seafaring, fishing, and ecology over thousands of years. Some of this knowledge is being documented through partnerships with universities and museums, but the loss of the physical homeland and the dispersal of communities make full cultural preservation enormously difficult. UNESCO has been working to recognize Pacific island intangible cultural heritage; some communities are creating digital archives to preserve language, oral history, and traditions.
Key Facts
- Tuvalu, Kiribati, the Maldives, and the Marshall Islands all face existential climate threats.
- The Maldives has the world's lowest average elevation (1.5 m).
- Several islands have already disappeared, including Lohachara in the Bay of Bengal.
- Carteret Islanders are sometimes cited as the first complete climate refugees.
- Disappearing islands threaten maritime EEZ rights worth billions of dollars.
- About 75% of lightning happens inside or between clouds, never reaching the ground.
- Sprites and jets above thunderstorms weren't discovered until 1989.
- Ball lightning remains one of the few accepted but poorly understood phenomena.
- Volcanic eruptions can produce lightning in their ash plumes.
- Lightning strikes kill about 24,000 people worldwide each year.
The Bottom Line
Lightning is caused by the rapid buildup and sudden discharge of electric charge in thunderstorm clouds. The charge separates through collisions between ice particles in the cloud, eventually creating voltages enormous enough to ionize air and conduct current to ground or to other charged regions. The resulting flash is so hot and bright that it superheats air, creating thunder. Despite being one of nature's most familiar phenomena, lightning still fascinates and surprises scientists studying its precise mechanisms.