Impact of Climate Change for Coffee

Estimated reading time: 5 minutes

Coffee is often discussed as a craft product, a commodity, and a daily ritual. It is also a climate-sensitive crop with unusually tight environmental limits. When those limits shift, entire producing regions feel the strain.

That matters far beyond the farm. Coffee supports the incomes of millions of growers, pickers, processors, exporters and traders, while cafés, hotels and hospitality venues depend on a stable supply and consistent quality.

The impact of climate change on coffee production means that a warmer planet does not simply make coffee more expensive. It changes where coffee can be grown, how reliably it can be harvested, and what ends up in the cup.

Research from academic and industry sources now points in the same direction: many current coffee-growing areas, especially for Arabica, are becoming less suitable as temperatures rise and rainfall patterns become less predictable.

Some higher-altitude areas may gain suitability, but that is not a simple swap. New land is limited, ecosystems are fragile, and moving production uphill creates its own social and environmental pressures.

Why Coffee Production is Highly Sensitive to Climate Change

Coffee is not a crop that thrives under wide-ranging conditions. Arabica, which accounts for most of the world’s coffee and a large share of global production overall, performs best within a fairly narrow temperature band.

Too much heat speeds fruit development, reduces bean density, and can flatten flavour. Too little rain weakens flowering and cherry formation. Heavy rain at the wrong moment can damage blossoms or disrupt drying.

Robusta is generally more heat-tolerant than Arabica, which is one reason some producers are considering a shift in varieties. Yet Robusta is not immune to climate stress either. Excess heat, irregular rainfall, pest pressure and extreme weather can still reduce yields and quality.

Coffee farming depends on a balance of conditions:

• Moderate temperatures
• Predictable wet and dry seasons
• Suitable altitude
• Healthy soils
• Shade and moisture retention

Once that balance starts to move, coffee plants do not simply carry on with slightly lower output. Whole growing calendars can change, flowering can become erratic, and disease pressure can intensify.

How Rising Temperatures and Erratic Rainfall Affect Coffee Harvests

The clearest climate signal for coffee is warming. Studies have linked higher average temperatures and altered rainfall patterns to lower yields, poorer quality and increased pest and disease pressure. Arabica is especially exposed in lower-altitude zones, where even a modest temperature rise can push farms outside their ideal range.

This is why mid-century projections are so serious. Several studies suggest that by around 2050, a large share of land currently suitable for Arabica may no longer be viable under some climate scenarios. At the same time, some cooler, higher-altitude areas may become more suitable. That offers limited relief, not a full answer.

A coffee farm on a steep hillside shows stressed coffee plants under harsh sun and broken weather, with lower slopes looking dry and higher ground greener.

The issue is not heat alone. Climate change also brings more erratic rainfall, longer dry spells, sudden downpours and greater weather volatility. Coffee responds strongly to seasonal patterns, so disruption at key points in the cycle can hit both quantity and quality.

The most common effects show up in several ways:

• Yield losses: fewer cherries, smaller harvests, reduced farm income
• Quality decline: lower bean density, less uniform ripening, weaker cup profile
• Pest pressure: insects surviving or spreading in warmer conditions
• Disease risk: fungal outbreaks are increasing where moisture and temperature favour them
• Location shifts: lower-altitude farms becoming less suitable over time

What is changing is not just whether coffee grows, but where, at what quality, and at what cost.

Coffee Growing Regions Under Pressure from Climate Change

Different coffee regions face different combinations of stress. Some are warming steadily. Some are seeing more violent swings between drought and heavy rain. Others are dealing with unusual cold snaps layered onto a long-term warming trend.

Brazil Coffee Production and Climate Extremes

Brazil remains the largest coffee producer in the world, so what happens there affects global prices and availability almost immediately. Its coffee sector is also a vivid example of climate volatility. Long dry spells, high temperatures and sudden cold events can now occur in combinations that were once far less common.

The 2021 season drew global attention after severe frost struck Brazilian coffee regions already stressed by drought. Frost may sound at odds with global warming, yet climate change does not remove cold extremes from every place.

In some cases, it appears to intensify weather instability. For coffee growers, the result was devastating: damaged trees, lower production and a slower recovery, illustrating the impact of climate change on coffee production, as coffee plants need time to regain strength after severe stress.

Brazil also illustrates the quality challenge. Arabica has long been central to the country’s reputation and export profile, but hotter conditions are increasing pressure on traditional growing areas. In some zones, producers are reassessing variety choice, farm altitude, shade management and irrigation. None of these options is cost-free, and not every farm has the capital to make changes quickly.

Central America Coffee Harvests and Coffee Leaf Rust

Central America is one of the clearest examples of how climate change and disease can interact. The region’s mountainous coffee landscapes have long supported high-quality Arabica, yet they are increasingly exposed to warmer conditions and unstable rainfall.

From 2012 onward, coffee leaf rust spread through parts of Central America and the Caribbean with severe consequences. Farms reported heavy yield losses, reduced incomes and job cuts for seasonal workers. In some communities, the damage fed into wider social strain as coffee labour is a cornerstone of local economies.

Lower-altitude farms have been particularly vulnerable. Research has suggested that while some higher areas could gain climatic suitability, lower and warmer zones are likely to lose it. That means regional adaptation is not simply about saving all existing farms in place.

In many cases, it involves difficult decisions about replanting, crop diversification, shade systems and long-term land use.

East African Coffee in Kenya, Ethiopia and Uganda

East Africa matters enormously to coffee, not only because of production volumes but also because of quality and genetic heritage. Ethiopia is widely recognised as the birthplace of Arabica coffee, and its diverse coffee landscapes are important to the future of the crop.

Kenya, though smaller in volume, is prized for distinctive acidity and clarity in the cup. Uganda is a major producer too, with both Arabica and Robusta systems under pressure.

Kenya has seen a clear warming trend over recent decades, alongside more erratic rainfall. That combination affects flowering, fruit development and disease risk. Producers may harvest less, or they may harvest coffee that lacks the consistency buyers expect from top-grade lots.

Ethiopia faces a deeper symbolic and practical concern. If warming and rainfall variability undermine coffee in one of its most historically significant homes, the implications are global. Millions of livelihoods are tied to Ethiopian coffee, and many of the country’s finest coffees depend on delicate local microclimates. A shift in those conditions can change flavour as well as output.

Uganda is often discussed less than Brazil or Ethiopia, yet it is highly exposed. Heat stress in lower areas, rainfall disruption and pest pressure can all affect productivity. As elsewhere, some higher zones may gain relative advantage, but relocation is constrained by land, infrastructure and forest protection needs.

Coffee Leaf Rust, Pests and Shifting Disease Patterns

Coffee leaf rust is the most widely cited disease in climate discussions, and with good reason. Caused by the fungus Hemileia vastatrix, it attacks leaves, weakens photosynthesis and can sharply cut yields. Once a severe infection takes hold, trees may defoliate and struggle for several seasons.

Climate change does not create leaf rust out of nowhere, but warmer and wetter conditions in certain settings can make outbreaks more likely or more damaging. That is part of a wider pattern in coffee: pest and disease pressure often rises when weather becomes less stable. Insects can move into areas that were once too cool, and stressed plants are less resilient.

A historic warning comes from Sri Lanka, then Ceylon, where coffee leaf rust devastated the coffee industry in the nineteenth century and helped drive a shift towards tea. The modern warning came from Central America after 2012, when rust outbreaks affected a major share of the region’s farms.

Climate Change Adaptation in Coffee Farming

There is no single fix for coffee and climate change, but there are practical steps with good evidence behind them. One of the most promising is agroforestry, where coffee is grown among shade trees and other vegetation rather than in exposed monoculture systems. Shade can reduce air and soil temperature, retain moisture, support biodiversity and create a more stable microclimate.

Higher shade-tree density can buffer extreme heat, though the ideal level varies by place and variety. Too much shade can reduce productivity in some settings, so adaptation needs local knowledge rather than blanket rules. Even so, the direction of travel is clear: farms with healthier tree cover often have more climate resilience than farms stripped back to bare production efficiency.

Other adaptation measures include:

• Improved varieties: plants selected for higher yield, disease resistance, or heat tolerance
• Soil care: mulching, organic matter, water retention
• Farm design: contour planting, windbreaks, shade planning
• Weather services: better forecasts and earlier action on disease risk

There is also growing interest in lesser-known coffee species. Coffea stenophylla, a rare West African species, has attracted attention because it appears better able to cope with warmer conditions while still offering desirable flavour traits. It is not ready to replace Arabica at scale, though it shows that genetic diversity could be valuable in a hotter future.

Mitigation matters as much as adaptation. Coffee farming can contribute to emissions through fertiliser use and land-use change, especially where forest is cleared for expansion. Protecting forest cover, improving yields on existing farmland, and avoiding deforestation are central if the sector is to remain viable without deepening the climate problem it faces.

Is coffee bad for climate change?

This question needs a careful answer. Coffee itself is not a single climate outcome. Its footprint depends heavily on how it is grown, processed, transported and packed.

Coffee can contribute to climate change when forests are cleared for new farms, when production relies heavily on synthetic inputs, or when wet processing uses large amounts of water and energy. Roasting, packaging and shipping also add emissions. Even the way coffee is brewed at home matters a little, though farming and land use tend to matter more than the kettle.

At the same time, not all coffee systems are equally harmful. Shade-grown coffee and agroforestry systems can store more carbon, protect soils, support wildlife and lower temperature stress for the crop itself. In plain terms, coffee can be part of a more damaging agricultural model or part of a more resilient one.

What coffee buyers and the trade can do about coffee and climate change

The response is not only in the hands of farmers. Roasters, retailers, cafés and customers all shape what gets rewarded in the market. If the trade demands very low prices while also asking producers to invest in shade trees, irrigation, labour and replanting, the maths rarely works.

There are a few sensible things buyers can look for when coffee climate change concerns are part of the decision:

• Shade-grown or agroforestry-linked coffees
• Transparent sourcing: clearer information on origin, farming conditions and producer support
• Organic or Rainforest Alliance options, where these fit the farm model
• organic coffee choices where these fit the farm model
• Realistic pricing: willingness to accept that resilient farming often costs more

Some merchants are also trying to reduce their own impact rather than placing the whole burden on producers. The Kent and Sussex Tea and Coffee Company, for example, over the years planted a tree with every online order and offers Rainforest Alliance and organic coffee choices alongside brewing guidance for customers. Steps like these do not solve the wider climate problem on their own, but they do point in a more responsible direction.

For trade customers, the issue is also about planning. A café or retailer that depends on one origin or one flavour profile may need more flexibility in the years ahead.

Seasonal changes, smaller crops and shifts in quality are likely to remain part of the coffee market, which makes sourcing relationships and good communication more valuable than ever.

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Author: Richard Smith

Partner at The Kent and Sussex Tea and Coffee Company

Richard Smith is a Tea expert, entrepreneur, and owner of The Kent and Sussex Tea and Coffee Company. Part of a family of renowned Tea planters dating back four generations, he was born in Calcutta (Kolkata), India, where he spent his childhood between Tea Estates in Assam and Darjeeling.

In the late 1970s, having accumulated years of knowledge in the industry, Mr Smith and his mother, Janet Smith, moved to Kent, South East England, to establish a Tea business in the village of Pluckley. Their early days of packing Tea Bags by hand from chests of 10,000 prompted the creation of the company’s flagship infusion known as Pluckley Tea. It remains our most popular product today.

Mr Smith, who studied economics at London Polytechnic, has since specialised in over 1,000 types of Loose Leaf Tea – in addition to around 70 varieties of Roast Coffee – from around the world. These are now available at The Kent and Sussex Tea and Coffee Company, where everything is still packed by hand and fresh to order, not only to honour tradition but to ensure the utmost quality and consistency.