The Drip News

Tag: Roasting

  • How Climate Change Is Affecting Coffee

    Climate change is the largest single threat facing coffee production in 2026. Rising average temperatures, irregular rainfall, expanding pest and disease pressure, and extreme weather events are all reshaping where coffee can be grown, how much can be produced, and what it tastes like.

    The arabica problem

    Arabica, the species responsible for nearly all specialty coffee, is particularly vulnerable. It thrives in a narrow temperature range, typically 18-22 degrees Celsius annual average. Above that range, the plant produces less, the cherries develop too quickly, and the bean’s complex flavor compounds do not fully develop.

    As global temperatures rise, the optimal arabica zone is moving up the mountains and away from the equator. Farms at elevations that produced excellent coffee in 2000 are now seeing yield declines and quality issues. The available higher land for relocation is limited.

    Specific impacts

    Brazil: increasingly frequent droughts in the major growing regions. Two consecutive low-yield harvests in 2024-2025.

    Colombia: historic flooding events damaging farms; rust pressure expanding into previously safe altitudes.

    Vietnam: drought reducing robusta production at scale.

    Central America: cumulative effects of recurring rust outbreaks and irregular rainfall.

    Ethiopia: the original arabica heartland is also seeing climate stress, particularly at lower elevations.

    The yield numbers

    Studies project that without significant adaptation, 50% or more of the land currently suitable for arabica may become unsuitable by 2050. Yields per hectare are already trending down in many regions.

    What producers are doing

    Several adaptation strategies are spreading. Resistant varieties (Castillo, F1 hybrids) replace traditional cultivars. Shade-grown systems use trees to moderate temperature. Higher-altitude relocation where feasible. Drought-tolerant practices including irrigation in regions that historically relied on rainfall.

    Some farms are also experimenting with growing robusta at altitudes traditionally reserved for arabica, since robusta tolerates climate stress better.

    What it means for drinkers

    Expect prices to keep trending up over the next decade. Expect flavor profiles to shift as varieties change. Expect more focus on sustainability practices, both for genuine impact and for marketing. The era of cheap, abundant arabica is unlikely to return.

    Supporting roasters who pay above-commodity prices to producers, particularly producers investing in climate adaptation, is one practical way to make the supply chain more resilient.

  • What Is Coffee Rust Disease?

    Coffee leaf rust (Hemileia vastatrix), commonly called roya in Spanish-speaking producing countries, is a fungal disease that attacks coffee plants. It has caused major outbreaks for over 150 years and is one of the most economically damaging diseases in agriculture.

    What it does

    The fungus infects the underside of coffee leaves, producing distinctive orange-yellow spots. As infection progresses, leaves drop prematurely. Without leaves, the plant cannot photosynthesize, the cherry yield collapses, and the plant itself can die in severe cases.

    Once a plantation is infected, full recovery takes years. Trees need to be either treated repeatedly or removed and replanted with resistant varieties.

    The 2012 Central American outbreak

    The most devastating recent outbreak began in Central America around 2012. Within three years, rust had reduced coffee production in countries like Guatemala, Honduras, El Salvador, and Costa Rica by 30-50% in many regions. Hundreds of thousands of farm workers lost income. Several countries declared coffee emergencies.

    The outbreak particularly affected the traditional Bourbon and Typica varieties that produced the region’s celebrated washed coffees. Many farms were forced to replant with disease-resistant cultivars that are less prized for cup quality.

    The climate connection

    Coffee rust thrives in warm, humid conditions. Higher elevations were historically protected because cooler temperatures slowed the fungus. As average temperatures rise, the rust-favorable zone is moving uphill, reaching elevations that were previously safe.

    The combination of warming temperatures, irregular rainfall patterns, and increased humidity at higher altitudes has made rust outbreaks more frequent and harder to contain.

    How farms fight it

    Three main approaches: fungicide treatments (effective but expensive and environmentally controversial), shade management (heavier shade slows rust progression), and resistant varieties (Castillo, Marsellesa, F1 hybrids like Centroamericano). The trend has been toward resistant varieties because they reduce ongoing chemical inputs.

    Why it matters to drinkers

    Major rust outbreaks reduce supply and push prices up. They also push producers toward rust-resistant varieties, which are often less interesting in the cup than the traditional Typica and Bourbon they replace. The flavor profile of Central American coffee in 2026 differs measurably from 2010, partly because of variety changes driven by rust.

  • What Does Specialty Grade Coffee Mean?

    Specialty grade coffee, in the technical sense, is green coffee that has scored 80 or higher on a 100-point scale developed by the Specialty Coffee Association (SCA). The scoring evaluates flavor, aroma, body, acidity, balance, and overall cup quality. It also requires specific physical defect criteria in the green beans.

    The scoring system

    A trained Q grader (a certified coffee evaluator) cups (tastes) the coffee and scores it across 10 attributes: fragrance/aroma, flavor, aftertaste, acidity, body, balance, uniformity, clean cup, sweetness, and overall. Each attribute is scored 6.00 to 10.00, summed for a maximum of 100.

    80-84.99: Specialty (the entry level for the term).

    85-89.99: Excellent specialty. The territory most third-wave single origins occupy.

    90-94.99: Outstanding. Competition coffees, microlots, and exceptional single origins.

    95+: Extremely rare. Reserved for the very best lots in a given year.

    The defect side

    Beyond cupping score, specialty grade has strict defect criteria. The green sample must contain zero category 1 defects (full black beans, full sour beans, dried cherries, large stones, large sticks) and no more than 5 category 2 defects (partial black beans, hulls, small stones) per 350-gram sample.

    Commercial-grade coffee allows many more defects. The visual difference between a specialty-grade and commercial-grade green coffee sample is immediately obvious to a trained eye.

    What it means at retail

    Most coffee labeled “specialty” in cafes and roasters does meet the 80+ standard. Some bags will actually print the score. Coffees scoring 86-88 are common in third-wave roasters; coffees above 90 are usually reserved as premium offerings.

    The term gets stretched marketing-wise. Some grocery-store coffee uses “specialty” loosely without verification. Reputable specialty roasters take the technical definition seriously.

    What it does not tell you

    SCA score is one assessment by trained evaluators on a specific day. It does not capture every aspect of quality, and high scores are not always correlated with what individual drinkers will love. A 92-point coffee with intense fermented fruit notes might score well technically but not match your taste. Use the score as a quality floor, not as a final verdict on flavor.

  • What Is Direct Trade Coffee?

    Direct trade is a coffee sourcing model where roasters buy green coffee directly from farmers or cooperatives, bypassing the traditional chain of brokers, importers, and exporters. The goal is better prices for producers, more transparency for buyers, and stronger long-term relationships.

    How it differs from fair trade

    Fair trade is a formal certification with set minimum prices and audit requirements. Coffee with the Fair Trade Certified label has been verified by a third party against standardized criteria.

    Direct trade has no formal certification. Each roaster defines what direct trade means for them. The term implies a direct relationship between roaster and farm but is not independently verified. This is both a strength (flexibility) and a weakness (no policing).

    What direct trade looks like in practice

    A roaster might visit specific farms each year, taste lots, negotiate directly with producers, and pay prices well above the commodity baseline. They build multi-year relationships, sometimes pre-financing harvests or investing in farm infrastructure.

    Counter Culture, Intelligentsia, Stumptown, Ritual, and many other respected roasters were early adopters of direct trade models. The premium prices they pay (often 50-200% above the C market) flow more directly to producers than commodity-channel sales.

    The problems with direct trade

    Without certification, the term has no enforcement. Any roaster can claim direct trade without verification. Some claims are real and substantive; others are marketing language with little behind them.

    Direct trade is also harder for small farms to access. Roasters tend to build relationships with farms large enough to consistently produce quality lots. Smallholders often still rely on cooperatives or commodity channels.

    How drinkers can evaluate it

    The most reliable signal is specificity. A roaster who mentions specific farm names, producer profiles, harvest details, and the prices paid is more credible than one who just says “direct trade” without elaboration.

    Many serious roasters publish transparency reports listing exactly what they paid each producer. This is the gold standard. If you care about ethical sourcing and a roaster does not provide this, ask. Most will respond honestly.

  • What Is a Coffee Cherry?

    A coffee cherry is the fruit that grows on coffee trees. It looks roughly like a small red cherry, hence the name. The “bean” we eventually grind and brew is the seed inside the cherry.

    What it looks like

    Coffee cherries start green and turn yellow, then red, then deep red-purple as they ripen. A few rare varieties ripen yellow instead of red. A ripe cherry is about the size of a small grape, with a thin skin, sticky pulp, and two seeds nestled together inside.

    Inside the cherry

    Each cherry typically contains two seeds (the green coffee beans we recognize). The seeds are separated by a thin layer called the silver skin. Around each seed is a tougher protective layer called the parchment. Around the parchment is the sticky mucilage, then the pulp, then the outer skin.

    Occasionally a cherry contains only one round seed instead of two flat ones. This is called a peaberry, and some farms separate and sell peaberries as a distinct lot.

    What happens to the cherry

    Processing involves removing some or all of the layers around the seed. Washed processing removes the skin, pulp, and mucilage before drying. Natural processing dries the whole cherry intact, then removes everything afterward. Honey processing falls in between.

    Cascara: drinking the fruit

    The dried cherry skin and pulp, called cascara (Spanish for “husk”), can be brewed as a tea-like drink. It tastes of dried fruit, hibiscus, and faintly of cherry. Cascara had a moment of popularity in third-wave cafes around 2015 and remains available from some specialty roasters.

    Why it matters to drinkers

    Knowing what the cherry is helps you understand processing terminology. When you read that a coffee was “depulped and dry-fermented,” you know that means the skin and most of the pulp were removed, leaving the parchment-coated bean to ferment without water. The vocabulary becomes useful instead of arbitrary.

  • Why Are Some Coffees More Acidic Than Others?

    When coffee professionals talk about acidity, they do not mean the pH of your cup. They mean a quality of brightness and liveliness in the flavor, similar to the snap of a green apple or the zing of a lemon. Some coffees have a lot of it, some have very little, and the reasons span the entire production chain.

    Origin and altitude

    Higher altitude growing regions tend to produce more acidic coffees. The cooler temperatures slow cherry development, allowing more complex acid compounds to form in the bean. Coffees from Ethiopia, Kenya, and Colombia (often grown above 1,500 meters) tend to be brighter and more acidic than coffees from Brazil or Sumatra (often grown lower).

    Processing method

    Washed coffees emphasize acidity. Stripping away the fruit before drying lets the bean’s intrinsic compounds dominate. Natural and honey processed coffees, where the bean stays in contact with sugary fruit during drying, develop more body and sweetness, often masking some of the acidity.

    Roast level

    Lighter roasts preserve acidity. Darker roasts break down the acidic compounds during the longer roasting time, leaving a heavier, more bitter cup. If you want to taste acidity, drink lighter roasts. If you want to mute it, drink darker.

    Brewing method

    Pour-over and AeroPress with paper filters highlight acidity. French press and full-immersion methods produce a heavier-bodied cup that mutes acidity by comparison. Espresso concentrates everything, including acidity, but balances it with body.

    Is acidity good or bad?

    Neither, on its own. Bright, well-integrated acidity is one of the joys of specialty coffee. Sour, unpleasant acidity (often from underextraction) is a brewing problem to fix. The acidity of a Kenyan SL28 should taste like blackcurrant or grapefruit, not battery acid.

  • Arabica vs Robusta: What Is the Difference?

    Arabica and robusta are the two coffee species that dominate global production. They are different plants, different beans, and different cups, with different histories and different roles in the modern coffee industry.

    Arabica (Coffea arabica)

    The original specialty species. Arabica accounts for about 60-70% of global production and dominates specialty coffee. The plant is delicate, requires high altitudes (above roughly 1,000 meters), and is vulnerable to pests, disease, and climate stress.

    Cup character: more complex, more acidic, more aromatic, often sweeter. Lower caffeine content (around 1.2% by weight). Most of what you taste in good coffee is Arabica.

    Robusta (Coffea canephora)

    The commodity workhorse. Robusta accounts for the remaining 30-40% of production and dominates instant coffee, supermarket blends, and traditional Italian espresso. The plant is hardier, grows at lower altitudes, and produces higher yields per acre.

    Cup character: heavier body, more bitter, less aromatic complexity. Distinctively earthy, sometimes rubber or burnt-toast notes. Higher caffeine (around 2.2%, almost double Arabica). Produces more crema in espresso, which is why it shows up in many traditional espresso blends.

    The robusta renaissance

    For decades, specialty coffee dismissed robusta entirely. That has been changing. Premium-grade robustas from Uganda, India, and other origins are showing up in respected espresso blends. The species can produce genuinely good coffee when grown carefully and processed with attention.

    This is partly economic (climate change is making it harder to grow Arabica reliably, increasing pressure to find robusta alternatives) and partly stylistic (some roasters appreciate what high-quality robusta brings to a blend).

    How to spot the difference in a bag

    Specialty bags will almost always say “100% Arabica.” If a bag does not specify, it likely contains some robusta. Cheap supermarket coffee is usually a robusta-Arabica blend. Premium robusta blends will state their composition proudly because the producer has chosen the robusta intentionally.

  • What Is Honey Processed Coffee?

    Honey processed coffee, also called pulped natural, is a middle path between washed and natural processing. The bean’s outer skin is removed, but some of the sticky fruit layer (mucilage) is left attached when the beans are dried.

    Why “honey”

    The name has nothing to do with bees. It comes from the sticky, honey-like texture of the partially fruited beans during drying. Producers grade honey processed coffees by how much mucilage remains: white, yellow, red, and black honey, in increasing order of fruit retention and increasing intensity of effect on the cup.

    How it tastes

    Honey processed coffees fall between the cleanness of washed and the fruit intensity of naturals. They have more body and sweetness than a washed coffee from the same farm, but more clarity and brightness than a natural. Stone fruit notes like apricot, peach, and red fruit are common.

    White and yellow honey lean toward washed; red and black honey lean toward natural. Each has its own market.

    Where you find it

    Costa Rica popularized the modern honey process and remains the leading origin for it. Brazil, El Salvador, and Honduras also produce notable honey-processed lots. The technique has spread because it works in regions with limited water (washed processing uses substantial water) but where producers want more control than full natural drying offers.

    Why processing matters at all

    Processing is the second most important variable in green coffee character, after the variety and growing conditions. The same coffee, processed three ways, will produce three distinctly different cups. Honey gives producers a controllable lever for designing the final flavor profile they want.

  • Light vs Medium vs Dark Roast: What Is the Difference?

    The roast level of a coffee determines how much of the bean’s natural flavor versus the flavor of the roasting process itself ends up in your cup. Lighter roasts highlight the coffee. Darker roasts mask it under roast-derived flavors.

    Light roast

    Light roasts (sometimes called Cinnamon, City, or Light City) stop just after the first crack, when the beans first audibly pop during roasting. The beans are light brown, dry on the surface, and dense.

    Flavor: bright, acidic, fruit-forward. Light roasts let the bean’s variety and origin character come through clearly. A light-roasted Ethiopian washed will taste of jasmine and citrus. Often higher in caffeine per bean than darker roasts.

    Medium roast

    Medium roasts (City, Full City) go a bit further, into or just past the second crack zone. The beans are medium brown, slightly oily on the surface in some cases, with more developed body.

    Flavor: balanced. Less of the brightness of light roasts, more sweetness and roundness. Origin character is still recognizable but mellower. This is the sweet spot for many drinkers and the most common roast level for grocery specialty coffee.

    Dark roast

    Dark roasts (Vienna, French, Italian) push past the second crack and develop visible oils on the bean surface. The beans are dark brown to almost black.

    Flavor: bold, smoky, sometimes bitter. The origin character largely disappears under the roast flavors of caramelization, burned sugar, and char. Dark roasts have less perceptible acidity and a heavier body. Per gram, slightly less caffeine than light roasts (the longer roast burns some off).

    Which roast for which method

    Light roasts shine in pour-over and other manual methods that highlight clarity. Medium roasts are versatile across all methods. Dark roasts are popular in espresso (for traditional Italian-style espresso) and in milk drinks, where the bold flavor cuts through the milk.

  • Should You Store Coffee in the Freezer?

    The freezer can extend coffee’s shelf life from weeks to months, but only if you store it properly. Done wrong, the freezer is one of the worst places for your beans.

    The right way to freeze coffee

    Portion the beans into single-use airtight bags or jars before freezing. The amount you would use in 5-7 days per bag. Squeeze out all the air. Seal tightly. Label with the roast date. Freeze.

    When you want to use a bag, take it out, let it come to room temperature for 30 minutes (still sealed), then open. Brew through that bag normally over the next week. Never refreeze a bag once thawed.

    Why this matters

    The enemy of coffee is moisture. Every time you take coffee out of the freezer to grind a single dose, condensation forms on the cold beans. That moisture degrades the beans rapidly. By freezing in single-use portions, each portion is only thawed once.

    What freezing preserves

    Freezing slows down the chemical reactions that cause coffee to go stale. Aromatic compounds remain volatile but are far less reactive at freezer temperatures. Coffee frozen properly at one week post-roast can taste nearly as fresh at two months as it did at week one.

    What freezing does not do

    Freezing cannot bring stale coffee back. If your beans were already six weeks old when you froze them, you are preserving stale coffee. Freeze fresh, peak-window beans only.

    The simpler alternative

    If you drink coffee every day, just buy smaller bags more frequently. A 250g bag bought weekly outperforms a 1kg bag stored for a month, frozen or not.

  • What Is Anaerobic Fermentation in Coffee?

    Anaerobic fermentation is a coffee processing technique where cherries (or de-pulped beans) ferment in sealed, oxygen-free containers. Without oxygen, different microorganisms become active than in traditional open-air fermentation, producing distinctive flavor compounds.

    How it works

    Coffee cherries are placed in sealed plastic or stainless steel tanks. The remaining oxygen is consumed by initial microbial activity. From that point on, lactic acid bacteria and other anaerobic microbes drive the fermentation, which can last 24 to 200 hours depending on the producer’s recipe.

    Variations include carbonic maceration (whole cherries fermenting whole), thermal shock (cycles of hot and cold water), and double anaerobic (two stages of sealed fermentation). Each produces a different cup.

    What it tastes like

    Intensely fruity, often jammy or wine-like. Notes of strawberry, raspberry, tropical fruit, and sometimes spice or alcohol. The flavors are amplified versions of what the green coffee had naturally; in some cases they push past the bean’s natural character into something almost unrecognizable as coffee.

    Why producers do it

    Anaerobic processing commands a price premium and helps farms differentiate in a crowded specialty market. A well-executed anaerobic lot can sell for several times the price of a washed version of the same coffee.

    The honest take

    Anaerobic coffees are polarizing. Some drinkers love the wild, fruit-forward profile. Others find it overpowering and unrelated to what they want from coffee. The technique is also still evolving, and consistency varies between producers. Try one with low expectations and see where you land.

  • How Long Do Coffee Beans Stay Fresh?

    Roasted coffee beans are at their best between roughly one and four weeks after roasting. Before one week, they are off-gassing too much CO2 to brew evenly. After four to six weeks, the volatile aromatic compounds have started to fade and the cup turns flat.

    The freshness timeline

    Days 0-3 post-roast: Too fresh for most brewing methods. The CO2 produces excessive bloom and uneven extraction.

    Days 4-7: Espresso starts settling in. Pour-over still bloomy.

    Days 7-21: The peak window. Coffee tastes the way the roaster intended.

    Days 21-42: Still good, slowly fading. Flavor notes get less distinct.

    Day 42 onward: Stale territory. The coffee is drinkable but the brightness, sweetness, and complexity are gone.

    Whole bean vs. ground

    Pre-ground coffee loses freshness within hours of grinding, not weeks. The increased surface area exposes the coffee to oxygen and accelerates flavor degradation. Even the best beans, if pre-ground at the roastery and shipped, will be noticeably stale by the time you open the bag.

    Storage matters

    Keep beans in an airtight container at room temperature, away from light, heat, and moisture. The original bag with a one-way valve is fine if it reseals well. A purpose-built bean canister with a CO2-release valve is better for serious users.

    Do not refrigerate. The temperature swings every time you open the door cause condensation, which is the worst thing for coffee. The freezer can work for long-term storage if you portion beans into sealed bags and never refreeze, but for normal weekly drinking, room temperature is best.