Former Vice President Al Gore said the recent Central American migrant caravans seeking asylum in the U.S. were fleeing the ravages of global warming.

Gore said the so-called dry corridor, which includes El Salvador, Guatemala, and Honduras, “is the most vulnerable region in the world to global warming.”

“And they’ve gone without a harvest this year. Some have gone without a harvest for two years,” Gore told CNN’s Christiane Amanpour in an interview Wednesday. “That is one of the principal causes for them making that long journey.”

Thousands of Central American migrants have joined caravans headed for the U.S.-Mexico border in order to seek asylum. Most experts see them as economic migrants, coming to the U.S. for work.

This isn’t the first time Gore linked global warming to recent migrant caravans. In December, Gore called the caravans a “recent, startling example” of global warming forcing people to flee their homes.

However, Gore is not the first to label the caravans “climate refugees.” It’s part of a broader media narrative to link the thousands joining U.S.-bound caravans to global warming.

For example, The Guardian ran a story in October citing alleged experts who “say the big picture is that changing climate is forcing farmers off their land and it’s likely to get worse.”

That same month, The Huffington Post said the migrant caravan “foreshadows” what’s to come with global warming. And E&E News called the caravan a “preview of climate migrations,” that is, people driven from their homes due to man-made global warming.

Conflict scholars have largely debunked many of the claims linking global warming to armed conflict and migration.

To stem the tide of migrants, Gore said the U.S. needs to bring more economic and job security to Central America and work with the region’s governments “so they are not driven away from their homes.”

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