Because the rate of ice melt has been increasing significantly since 1992 and the land is sinking due to a process called subsidence, Hawaii is particularly vulnerable to an increased rate of sea level rise
sea level rise
Between 1901 and 2018, the globally averaged sea level rose by 15–25 cm (6–10 in). More precise data gathered from satellite radar measurements reveal an accelerating rise of 7.5 cm (3 in) from 1993 to 2017, for an average rate of 31 mm (11⁄4 in) per decade.
As the only U.S. state that is an island, Hawaiʻi is highly vulnerable to the effects of sea level rise. Vulnerability to sea level rise is based on modeling chronic coastal flooding with sea level rise due to passive flooding, annual high wave flooding, and coastal erosion in the SLR-XA.
HONOLULU (KHON2) — A federal report warns that sea level along America's coastline is projected to rise about a foot, on average, in the next 30 years. That's as much as the rise measured over the last 100 years.
But climate change threatens the iconic beach. With global sea levels conservatively estimated to rise at least 3 feet by 2100, Waikiki Beach may not be around at the turn of the century. Some scientists think Waikiki Beach could disappear even sooner.
Among the National Climate Assessment's findings for Hawaii:
shifting rainfall patterns, rising sea levels and changing ocean chemistry will affect people and ecosystems in Hawaii. flooding and erosion, damaging coastal ecosystems, infrastructure, and agriculture.
Scientists believe Hawaii could experience a sea-level increase of three feet by the year 2100, which is in line with global predictions of sea-level change and which would substantially reshape life on the Islands.
Climate change is fueling a surge in dangerous heat days with tens of millions of people affected. Today, Hawaii has 66,000 people at risk of coastal flooding. By 2050, an additional 152,000 people are projected to be at risk due to sea level rise.
There are numerous heavily populated sinking cities like Mumbai, Shanghai, NYC, and Miami at risk. With a population of 10 million, Jakarta is considered by some to be “the fastest-sinking city in the world” and is projected to be “entirely underwater by 2050”.
For South Florida, the region with the most coastal real estate at risk, the sobering prediction is that the sea will continue to rise — about 11 inches by 2040 — but the latest forecast is markedly less than atmospheric modeling runs produced just five years ago.
Sea level falls as the polar ice caps grow during cold-climate periods. The deepest reef is now located 4,380 feet below sea level, thereby demonstrating that the Big Island has sunk at least this much, and is still sinking, at a rate of nearly one tenth of an inch per year.
Hawai'i is getting drier. Rainfall has declined significantly over the past 30 years, with widely varying rainfall patterns on each island. This means some areas are flooding and others are too dry. Since 2008, overall, the islands have been drier, and when it does finally rain, it rains a lot.
Unlike on land where high elevations are relatively rare, much of the world ocean consists of very deep basins. On the Seafloor Map of Hawaiʻi, for example, the maximum depth is -5,795 meters and depths between -4,000 and -5,000 meters predominate.
But the iconic Waikiki Beach on the island of Oahu may soon be underwater: A 2017 report predicted that the tourist hotspot and the nearby city of Honolulu will experience regular flooding within the next two decades. Climate change is the cause of this unprecedented sea-level rise and subsequent flooding.
Hawaii's climate is changing. In the last century, air temperatures have increased between one-half and one degree (F). Warming in the oceans around Hawaii has damaged coral reefs, and, in recent decades, increased ocean acidity has threatened reefs and other marine ecosystems.
This is Kiribati. The first country that will be swallowed up by the sea as a result of climate change. Global warming is melting the polar icecaps, glaciers and the ice sheets that cover Greenland, causing sea levels to rise.
Many native Hawaiians, up to and including Governor David Ige, have made their stance on tourists visiting the islands explicitly clear these past several months: they don't want visitors right now. And for good reason. Chief among them is COVID.
Rising sea levels and recent storm surges have been causing faster-than-usual erosion along Hawaii's beaches and shorelines. Those beautiful Hawaiian beaches are apparently disappearing. Rising sea levels paired with recent storm surges have been causing faster-than-usual erosion along beaches and shorelines.
Presently the Hawaiian Islands and our part of the Pacific plate are moving northwest at about 100 mm (4 in.) per year, relative to the island-producing hot spot. The trajectory of motion points toward Hokkaido on the northern part of the Japanese Island chain, 6,300 km (3,900 mi) away.