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Beer faces unbitter future due to climate change: study

Beer faces unbitter future due to climate change: study
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Climate change threatens the cultivation in Europe of aromatic hops which gives beer its bitterness, according to a study published Tuesday in Nature Communications.

European varieties of hops are prized and used by brewers around the world, but rising temperatures and less rain are reducing yields and the concentration of the compounds that provide beer its refreshing tartness.


The researchers observed this trend by analysing data from five sites in the Czech Republic, Germany, and Slovakia, which along with Poland are the primary hops growers in Europe, study co-author Miroslav Trnka said.

Yields fell between 9.5 and 19.4 per cent at four sites and were stable at a fifth when data from 1995-2018 was compared with 1971-1994.

Meanwhile the concentration of the bitter compounds, alpha acids, decreased.

Extrapolating from the data, the researchers predicted a drop in yield of between four and 18 per cent, compared with 1989-2019 while the concentration of alpha acids could drop between 20 and 31 per cent as temperatures rise and rainfall is impacted.

With droughts expected to increase in central and southern Europe "it will be necessary to expand the area of aroma hops by 20 percent compared to the current production area to compensate for a future decline in" potency and yields, said the study.

It called for "urgent adaptation measures to stabilise international market chains" such as moving crops to more suitable areas or irrigating.

Hops farmers are trying to adapt, but Trnka said their options are limited as "hops needs a specific combination of climate and soil" and the introduction of genetically modified plants designed to better support warmer temperatures and drought is prohibited in Europe.

Brewers can also try to modify their methods to adapt to the reduced bitterness in hops.

(AFP)

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