(WP) - Season after season, he’d been growing and harvesting the same grapes on the same land. But five years ago, Livio Salvador began to wonder whether something was changing.

When he walked through his vineyards, he would see patches of grapes that were browned and desiccated. The damage tended to appear on the outside of the bunch — the part most exposed to sunlight. Salvador talked to other growers and winemakers in the region, and they were noticing it, too.

Their grapes were getting sunburned.

“It has almost become the norm,” Salvador said this month, after a torrid growing season that saw 10 percent of his fruit wither to waste under the sun.