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How sea level rise could impact millions of people, cost billions of dollars?

The Editorial covers GS paper 3[Conservation, environmental pollution and degradation, environmental impact assessment.]

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  • In a study published in the journal Scientific Reports, researchers predict that by 2100, the global population potentially exposed to episodic coastal flooding will increase from 128-171 million to 176-287 million. 

  • The value of global assets exposed to these episodes is projected to be between $6,000-$9,000 billion, or 12-20 percent of the global GDP.

What are the findings of the study?

  • The researchers note that sea-level rise (SLR) is a “well-accepted” consequence of climate change. 

  • Their study has found that globally, of the 68 percent area that is prone to coastal flooding, over 32 percent can be attributed to regional SLR. 

  • This, they say, will significantly increase coastal flooding by 2100.

  • Their results indicate by the year 2100, for most of the world, flooding incidents that are typically associated with a 1 in a 100-year event could occur as frequently as 1 in 10 years, “primarily as a result of sea-level rise.”

  • As per this assessment, 0.5-0.7 percent of the world’s land area is at risk of episodic coastal flooding by 2100, impacting 2.5-4.1 percent of the population, assuming there are no coastal defenses or adaptation measures in place.

How much of a threat is sea level rise?

  • Last year in September, Indonesia’s President Joko Widodo announced that the country’s capital would be relocated from Jakarta to the province of East Kalimantan on the lesser populated island of Borneo. 

  • The relocation was meant to reduce the burden on Jakarta, which has been facing problems such as poor quality air and traffic gridlocks and is particularly prone to flooding. 

  • It is also the largest Indonesian city with a population of 1 crore. 

  • It is located on the North West coast of the most populous island in the world, Java. 

  • The combination of climate change and heavy congestion continues to bury Jakarta, the “world’s fastest-sinking city”, by about 25 cm into the ground every year.

  • The situation looks grim for India’s financial capital Mumbai as well. 

  • As per some projections, climate change is expected to inundate significant sections of Mumbai by 2050, impacting millions of people.

  • Other cities that regularly feature in the lists endangered by climate change include Guangzhou, Jakarta, Miami, and Manila.

  • IPCC projections to maintain that SLR is going to accelerate further and faster in the coming years. 

  • Some of the expected impacts of SLR over the course of the century include habitat contraction, loss of functionality and biodiversity, and lateral and inland migration.

What are some ways of protecting against sea-level rise?

  • Indonesia’s government launched a coastal development project called a Giant Sea Wall or “Giant Garuda” (Garuda is the name of a bird from Hindu mythology and is Indonesia’s national symbol) in 2014 meant to protect the city from floods.

  • In a paper that was accepted for publication earlier this year in the Bulletin of the American Meteorological Society, researchers proposed an extraordinary measure to protect 25 million people, and important economic regions of 15 Northern European countries from rising seas as a result of climate change. 

  • They suggested a mammoth Northern European Enclosure Dam (NEED), enclosing all of the North Sea.



The idea involved the construction of two dams of a combined length of 637 km to protect Northern Europe against “unstoppable” SLR. They also identified other regions such as the Persian Gulf, the Mediterranean Sea, the Baltic Sea, the Irish Sea, and the Red Sea that could benefit from similar mega enclosures. A Special Report on the Ocean and Cryosphere in a Changing Climate, published last year by the IPCC, noted that “well-designed coastal protection” could both “reduce expected damages” and “be cost-efficient for urban and densely populated… areas”.

Source: Indian Express.