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The COP26 international climate talks in Glasgow this November couldn't come at a more crucial time.

World - Our underwater future: What sea level rise will look like around the globe

The planet is warming rapidly, resulting in historic drought, deadly floods and unusual melting events in the Arctic. It is also causing steady sea level rise, which scientists say will continue for decades.

A new study from Climate Central, a nonprofit research group, shows that roughly 50 major coastal cities will need to implement "unprecedented" adaptation measures to prevent rising seas from swallowing their most populated areas.

The analysis, in collaboration with researchers at Princeton University and the Potsdam Institute for Climate Impact Research in Germany, resulted in striking visual contrasts between the world as we know it today and our underwater future, if the planet warms to 3 degrees Celsius above pre-industrial levels.

Climate scientists reported in August the world is already around 1.2 degrees Celsius warmer than pre-industrial levels. Temperatures should stay below 1.5 degrees, they say — a critical threshold to avoid the most severe impacts of the climate crisis.

But even in the most optimistic scenario, where global greenhouse gas emissions begin to decline today and are slashed to net zero by 2050, global temperature will still peak above the 1.5-degree threshold before falling.

In less-optimistic scenarios, where emissions continue to climb beyond 2050, the planet could reach 3 degrees as early as the 2060s or 2070s, and the oceans will continue to rise for decades beyond that before they reach peak levels.

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"Today's choices will set our path," said Benjamin Strauss, the chief scientist at Climate Central and lead author on the report.

Climate Central researchers used global elevation and population data to analyze parts of the world that will be most vulnerable to sea level rise, which tend to be concentrated in the Asia-Pacific region.

Small island nations at risk of "near-total loss" of land, the report says, and eight of the top 10 areas exposed to sea level rise are in Asia, with approximately 600 million people exposed to inundation under a 3-degree warming scenario.

According to Climate Central's analysis, China, India, Vietnam, and Indonesia are in the top five countries most vulnerable to long-term sea level rise. The researchers note that these are also countries that have added additional coal-burning capacity in recent years.

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