To demonstrate, the post shows two jugs of water, one with ice blocks in it and another with all the ice melted. The water level in both jugs is the same.
“To you climate change activists. This is what happens when icebergs melt... nothing just figured you need the visual aid to believe it,” the post reads.
Does climate change – and melting icebergs – have no effect on sea levels? We checked.
Two ways climate change causes sea levels to rise
The UN Framework Convention on Climate Change works to help implement climate change treaties. An article on its website explains that climate change causes sea levels to rise in two ways.
One is the increased concentration of greenhouse gases in the atmosphere warming the oceans’ water.
“Hot water – less dense than cold water – takes up more space, causing the ocean to expand,” explains an article.
The other is ice at the north and south poles melting. This ice includes ice sheets and glaciers – not just icebergs.
‘Icebergs do not form in the ocean’
Africa Check asked Prof Andy Mahoney, an expert in sea ice physics at the University of Alaska, to clarify the science behind melting icebergs and rising sea levels.
Mahoney said he was familiar with the demonstration. “Although technically correct, the claim made in the Facebook post is still a case of misinformation.”
The post did accurately describe the melting ice blocks experiment, but did not adequately describe sea level changes, he said.
“Icebergs do not form in the ocean. They originate when snow falls on land and compresses under its own weight to form ice. Icebergs contribute to sea level rise not when they melt, but when they first meet the ocean.”
Climate change actually increases the formation of icebergs, as warmer temperatures cause more icebergs to calve from melting polar ice caps and fall into the ocean.
“To accurately represent processes associated with climate change, the demonstration should begin with an ice-free glass of water. This will clearly show that the water level in the glass increases when the ice is added,” Mohoney said. – Vincent Ng’ethe
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