How does climate change threaten coffee-growing regions and varieties?

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Arabica coffee is biologically conservative in its climate requirements: optimal growing temperatures of 18–22°C, well-defined wet and dry seasons, altitude as a temperature moderator, and specific soil conditions. Climate change is narrowing the geographic range that meets these requirements. Research published in Nature Plants (2019) projected that suitable land area for Arabica production could decline by 50% or more by 2050 under high-emission scenarios, with producing regions shifting to higher altitudes and latitudes — in many cases to land that is already forested.

Specific threats include: rising minimum temperatures accelerating ripening (reducing the time for complex flavour development), increased incidence of coffee leaf rust (Hemileia vastatrix) — a fungal pathogen that spreads more readily in warmer, wetter conditions and devastated Central American production in 2012–13 — irregular rainfall disrupting the dry seasons that define processing windows, and extreme weather events that damage infrastructure and harvest.

The industry response includes breeding programs developing rust-resistant and heat-tolerant varieties (World Coffee Research is the primary institutional actor), investment in agroforestry practices that moderate microclimate, and support for farmer adaptation capacity. Robusta, which tolerates higher temperatures and altitudes than Arabica, is positioned to expand its range and may become a more significant quality category as Arabica land contracts — driving investment in premium Robusta varieties and processing.

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Tags: #coffee-culture #climate-change #sustainability #arabica