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Now, global-warming activists are getting serious: They’re warning that the climate change they say mankind is causing could threaten the supply of beer.

A study published by the journal Nature notes beer is “the most popular alcoholic beverage in the world by volume consumed, and yields of its main ingredient, barley, decline sharply in periods of extreme drought and heat.”

“Although the frequency and severity of drought and heat extremes increase substantially in range of future climate scenarios by five Earth System Models, the vulnerability of beer supply to such extremes has never been assessed,” the scientists said.

They evaluated “the effects of concurrent drought and heat extremes projected under a range of future climate scenarios.”

“We find that these extreme events may cause substantial decreases in barley yields worldwide,” the scientists said.

“Average yield losses range from 3 percent to 17 percent depending on the severity of the conditions. Decreases in the global supply of barley lead to proportionally larger decreases in barley used to make beer and ultimately result in dramatic regional decreases in beer consumption (for example, −32 percent in Argentina) and increases in beer prices (for example, +193 percent in Ireland).”

The researchers said that while “not the most concerning impact of future climate change, climate-related weather extremes may threaten the availability and economic accessibility of beer.”

Courthouse News reports the study was conducted with financial support from the U.K. Economic and Social Research Council, Natural Environment Research Council, the British Academy and Philip Leverhulme Prize.

The researchers, the report notes, are from East Anglia University in Norwich, England, the home of some of the world’s leading global-warming scientists.

“Increasingly research has begun to project the impacts of climate change on world food production, focusing on staple crops such as wheat, maize, soybean, and rice,” said lead U.K. author Dabo Guan.

“However, if adaptation efforts prioritize necessities, climate change may undermine the availability, stability and access to ‘luxury’ goods to a greater extent than staple foods,” Guan said.

The researchers said they looked at 34 regions and then made models of the barley yields during “extreme climate events.”

“During the most severe climate events, study results indicate global beer consumption would decline by 16 percent, or 29 billion liters – roughly equal to the total annual beer consumption in the United States – and beer prices would double on average. Even in less severe extreme events, beer consumption drops by 4 percent and prices rise by 15 percent, according to the data,” the report said.

“It may be argued that consuming less beer isn’t itself disastrous, and may even have health benefits. Nevertheless, there is little doubt that for millions of people around the world, the climate impacts on beer availability and price will add insult to injury,” Guan said.

WND reported last week Harvard researchers found that the transition to wind or solar power in the U.S. would require up to 20 times more land than previously thought.

And they found that if such large-scale wind farms were built, they would warm average surface temperatures over the continental U.S. by 0.24 degrees Celsius.

In July, a United Nations official called for an “ark” to save the world from global warming.

Patricia Espinosa, the executive secretary of U.N. Climate Change, was speaking at a conference at the Vatican hosted by Pope Francis.

Climate-change skeptic Marc Morano of the Climate Depotsite noted Espinosa urged the world “to make the fundamental, transformative changes necessary” to fight “global warming.”

The Vatican’s International Conference was titled “Saving our Common Home and the Future of Life on Earth.”

“If we truly want to make the fundamental, transformative changes necessary to combat climate change, perhaps what we need then is not a physical ark, but an ark of ambition for #climateaction,” she tweeted.

Espinosa echoed former U.N. climate chief Christiana Figueres, reported Morano.

Figueres called for “centralized transformation” that will make things “very different” for life on the plant.

Espinosa said: “I want to begin by discussing a narrative that is common to many cultures and faith communities throughout the world. It’s the story of a great flood that took place long ago. While different cultures tell it in different ways, most outline how humankind not only had warning that rising waters were coming, but that those warnings were ignored. Now, let me be clear: I don’t propose we begin building an ark—at least not a physical one—but it’s hard to ignore some parallels with today. Every day we are seeing evidence of climate change and its devastating impacts on populations around the globe.”

She said climate change and the world’s response to it “raises larger questions about who we are, why we’re here, and where we’re collectively going.”

“Climate change is about morality: who are we to willingly destroy the ancient and intricate beauty of the world? Climate change is about legacy: who are we to leave a debt of neglect to an unborn generation?”

WND reported last year when Figueres was in Germany for a climate summit and laughed off questions about her call for a globally centralized planning structure.

Morano said he asked her about her message to President Trump and her own calls for a U.S. “centralized transformation” that “is going to make life of everyone on the planet very different.”

She laughed.

Blogger Tom Nelson recalled that in 2012 she said of her work, “It is the most inspiring job in the world because what we are doing here is we are inspiring government, private sector and civil society to [make] the biggest transformation that they have ever undertaken.

“The Industrial Revolution was also a transformation, but it wasn’t ‘a guided transformation from a centralized policy perspective.’ This [U.N. climate change action] is a centralized transformation that is taking place because governments have decided that they need to listen to science. So it’s a very, very different transformation and one that is going to make the life of everyone on the planet very different.”

Global warming activist Al Gore told an audience in 2009 that “the entire north polar ice cap during some of the summer months could be completely ice-free within the next five to seven years.”

He also predicted increasing temperatures would cause Earth’s oceans to rise by 20 feet, a claim many scientists say is utterly without rational basis.