Explained | How rising sea levels threaten agriculture, rainfall, and the social fabric Premium
The Hindu
The sea is swallowing the land, sending salt water underground, devouring forests, and forcing people to leave.
The World Meteorological Organization (WMO) has found in a new report that the world’s sea level is rising at an unprecedented rate, portending potentially disastrous consequences for the weather, agriculture, the extant groundwater crisis, and social disparities.
The report, entitled ‘State of the Global Climate 2022’, was published last week. Along with accelerating sea-level rise, it focused on a consistent rise in global temperatures, record-breaking increases in the concentration of greenhouse gases as well as glacier loss, sustained drought-like conditions in East Africa, record rainfall in Pakistan, and unprecedented heatwaves that struck Europe and China in 2022.
“Droughts, floods and heatwaves affected communities on every continent and cost many billions of dollars. Antarctic sea ice fell to its lowest extent on record and the melting of some European glaciers was, literally, off the charts,” per a press release.
While the sea-level rise is one of several compounding disasters, it also merits individual attention for the unique crises it can precipitate, especially for coastal areas, the communities there that depend on life in the sea, and its ability to render the loss of land.
How much is the sea rising?
The press release also said, “The rate of global mean sea-level [GSML] rise has doubled between the first decade of the satellite record and the last.”
Since the 1990s, scientists have been measuring sea-level rise using satellite altimeters. These instruments send radar pulses to the sea surface and measure the time they take to get back and the change in their intensity. The higher the sea level, the faster and stronger the return signal.
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