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(Image credit: Credit Unknown)

Cabernet Sauvignon has replaced Spain's Airen as the world's most popular grape variety, shows a new study, but researchers warned of shrinking diversity in vineyards.

There were close to 300,000 hectares of Cabernet Sauvignon planted around the world in 2010, up from just over 100,000 two decades ago, shows the University of Adelaide study.

Their work revealed the rising popularity of native French varieties, which have benefited from wider adoption in New World countries to account for 36% of global vineyard area in 2010, versus 26% in 2000.

In that time, Merlot has joined Cabernet Sauvignon at the top of the plantings league, moving into second place, overtaking Garnacha Tinta now 7th, leaving Airen in 3rd place overall.

Other big losers over the past two decades include Trebbiano Toscano, Mazuelo and Rkatsiteli, with many vines either ripped out or replaced in the 1990s.

But, the study has also served as a warning over shrinking diversity on the world wine scene.

‘Also of concern is that the diversity of winegrapes is narrowing to a few “international” varieties,’ said the researchers.

Their study shows that, in 2010, the top 35 grape varieties made up two thirds of the world’s winegrape growing area, versus 59% in 2000.

The top 10 grape variety plantings worldwide in 2010:

1. Cabernet Sauvignon

2. Merlot

3. Airen

4. Tempranillo

5. Chardonnay

6. Syrah

7. Garnacha Tinta

8. Sauvignon Blanc

9. Trebbiano Toscano

10. Pinot Noir

Written by Chris Mercer

Chris Mercer

Chris Mercer is a Bristol-based freelance editor and journalist who spent nearly four years as digital editor of Decanter.com, having previously been Decanter’s news editor across online and print.

He has written about, and reported on, the wine and food sectors for more than 10 years for both consumer and trade media.

Chris first became interested in the wine world while living in Languedoc-Roussillon after completing a journalism Masters in the UK. These days, his love of wine commonly tests his budgeting skills.

Beyond wine, Chris also has an MSc in food policy and has a particular interest in sustainability issues. He has also been a food judge at the UK’s Great Taste Awards.