Iceland paid tribute to its Okjokull ice sheet on Sunday, holding a funeral for the first glacier lost to climate change. Known as 'Ok' for short, Okjokull lost its status as a glacier in 2014. At Sunday's ceremony, mourners unveiled a plaque announcing that all the country's main glaciers are expected to follow the same path in the next 200 years.

The Thwaites Glacier, part of the West Antarctic ice sheet, is believed to pose the greatest risk to rising sea levels in the future. If it collapses and flows into the sea, it could trigger a 50 cm sea level rise, a NASA-funded study found earlier this year. Antarctica is home to 50 times more ice than all the world's mountain glaciers combined.

Chile's Grey Glacier is in the Patagonian Icefields, which account for the largest expanse of ice in the southern hemisphere outside of Antarctica. Researchers are closely monitoring the melt in the region, as it could help them understand how other glaciers, such as those in Antarctica and Greenland, could look in warmer climates of the future.

The Rhone Glacier in Switzerland is the source of the river Rhone. For several years, scientists have been covering its ice with UV-resistant white blankets during summer, in an attempt to slow the melting. Researchers say our warming climate could eradicate two thirds of the ice in Alpine glaciers by the end of this century.

Franz Josef Glacier in New Zealand's South Island is a popular tourist destination. The glacier used to follow a cyclical pattern of advance and retreat. But since 2008, Franz Josef has been rapidly shrinking. Guides used to be able to lead tourists straight onto the glacier by foot. Now, the only way they can get there is to fly in by helicopter.

Glaciers on Mount Kilimanjaro are also at risk. Back in 2012, NASA-supported researchers estimated what is left of the ice on Africa's highest mountain would be gone by 2020. Kilimanjaro is a top attraction for tourists in Tanzania, and a crucial generator of revenue in a country where the majority of people live below the poverty line.

The US state of Alaska is home to thousands of glaciers. Some of them are melting 100 times faster than scientists previously thought, a 2019 study found. Earlier this month, two Germans and an Austrian were found dead after going kayaking on Valdez Glacier Lake. Officials say the tourists were likely killed by falling glacial ice.

Jakobshaven, Greenland's largest glacier, is actually growing, a NASA study revealed earlier this year. But while one edge of the glacier has thickened slightly since 2016, the overall ice sheet is still melting rapidly, far outweighing expansion. Scientists believe the growth is due to an influx of unusually cold water from the north Atlantic - but they expect warmer waters will soon return.