Climate study warns heat and water stress will reshape olive oil quality
A Turkish agriculture journal says temperature and rainfall are decisive for olive cultivation and warns that heat, evaporation and water stress will alter yield, ripening and oil quality.
Climate conditions are becoming a decisive variable for olive oil quality, with temperature and rainfall influencing not only output but the characteristics of the final product. That is the main message of an analysis published in the Olive Research Institute Journal of Türkiye’s Agriculture and Forestry Ministry. The study says excessive heat and cold stress can hurt both yield and quality in olive cultivation.
The paper argues that future climate projections pose a broad set of risks for perennial crops such as olive trees. Those risks include shrinking water resources, disruptions in plant physiological processes, shifts in phenological cycles and declines in both production and product quality. The Mediterranean climate zone, where olive cultivation is widespread, is highlighted as especially exposed because rising temperatures are paired with higher evaporation rates.
Researchers say those shifts are likely to extend growing seasons, alter flowering periods and accelerate fruit ripening. In practical terms, that can push harvest timing into new windows and affect both maturity levels and the quality profile of olive products. For the olive sector, that matters not only agronomically but commercially, because harvest timing, fruit condition and oil quality all feed directly into processing choices and market value.
The article also places the issue in a wider production context. According to the study, Türkiye’s share of global olive oil production rose from 5.5 percent to 13 percent over the past 35 years. Global output stood at about 1.4 million tons in 1990, climbed to a peak of 3.5 million tons in 2021, fell to 2.5 million tons in 2023 and recovered to roughly 3.4 million tons in the 2024-2025 period. Spain remained the largest producer, although its share slipped from 44 percent to 38 percent over the same period.
Italy has maintained relatively stable annual production of around 300,000 to 500,000 tons, while Greece has fluctuated between 200,000 and 400,000 tons. Türkiye, the study says, has emerged as the largest producer outside the European Union with a production capacity in the same 200,000-to-400,000-ton range. For European and Mediterranean agriculture, the takeaway is that climate pressure is no longer an abstract long-term concern: it is increasingly tied to yield risk, harvest timing, quality outcomes and competitive positioning in the olive oil market.