It's the main event in the battle over how to close a bottle of wine: Cork vs. screw cap. To some, it's a matter of style. To others, it's an issue of quality. And now, it's a question of what is best for the environment.

Cork was the standard closure for ages. But winemakers began moving to alternatives in the past decade because of problems with cork that were ruining wines. Screw caps became a popular option and are now seen topping many fine wines, such as some bottles from Napa's PlumpJack winery that sell for $100 or more.

But some winemakers and environmental groups are urging wineries to return to basics — saying cork is the best choice for the environment.

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