Last week, as Buenos Aires broke records for both the hottest and coldest February temperatures, Secretary General António Guterres said that climate change could leave parts of the Argentine capital, as well as other metropolises around the world, swamped by rising sea levels  by 2050.

“Low-lying communities and entire countries could disappear forever,” said Guterres in a speech to the UN Security Council. “We would witness a mass exodus of entire populations on a biblical scale.”

“Mega-cities on every continent will face serious impacts including Lagos, Maputo, Bangkok, Dhaka, Jakarta, Mumbai, Shanghai, Copenhagen, London, Los Angeles, New York, Buenos Aires and Santiago.”

Guterres cited the fact that some coastlines have already seen triple the average rate of sea-level rise. The data he referenced was used to create an interactive flood map by Climate Central which clearly shows the areas that could be underwater by 2050. The map can be visited here.

The red zones show areas where the land is below the predicted annual flood level. In central Buenos Aires, that includes La Boca, Puerto Madero, and the Costanera Norte. In Buenos Aires province, areas at risk include most of the Tigre Delta as well as swaths of the coast from Quilmes to La Plata. To the south, the Samborombón bay and vast areas of the Bahía Blanca coastline are also in danger of being underwater.

According to the World Meteorological Organization (WMO), the rise of sea levels is accelerating and the global ocean has warmed faster over the past century than in the past 11,000 years.

“Our world is hurtling past the 1.5-degree warming limit that a livable future requires, and with present policies, is careening towards 2.8 degrees — a death sentence for vulnerable countries,” said Guterres.

“We urgently need more concerted action to reduce emissions and ensure climate justice.”