What is shade coffee?

Two-thirds of the world's coffee comes from Latin America and the Caribbean [source: NSCC]. When most of us imagine these coffee farms -- if we ever do -- we see long stretches of shrubs bathing in sunlight. This type of cultivation is called monoculture -- a single plant species dominating a stretch of crop land.

Lots of coffee beans are sun-grown in this way, especially the largest, mass-produced brands. But it's not the only way to grow coffee. The monoculture method has only been around for about 30 years. The traditional way of growing coffee is in the shade, under a canopy of trees and fauna. This "rustic" technique creates an arguably tastier cup of coffee, allows for organic growing methods free from pesticides and herbicides, decreases the need for complex farm machinery, and provides excellent housing for countless plant and animal species. Shade-grown coffee is actually one of the greatest crops for maintaining a diverse ecosystem.

So why the switch to sun? Business, of course. Coffee plants grow faster and more plentiful in sunny conditions, and clearing other vegetation from the land leaves much more space for coffee plants; but sun-grown coffee has always been overly susceptible to disease. In the 1970s, researchers developed sun-tolerant coffee strains, along with chemicals that could protect coffee from the harmful effects of sun, opening the door to a whole new world of java. A sun-grown coffee bush can produce up to three times more beans than a bush in the shade, and more of those bushes can occupy a given plot of land, meaning higher profits for the farm and the brand [source: NSCC].

But that's just part of the story. It turns out that growing coffee in the sun instead of the shade has some pretty devastating effects on the environment.

Clearing forests to grow acres and acres of coffee bushes has side effects that have only recently gained widespread attention -- resulting in those "shade-grown" coffee brands you see on store shelves. Shade coffee grows in the thick vegetation of forests.

Traditional coffee orchards are home to birds, insects, ants, amphibians, butterflies, reptiles, trees, epiphytes (such as orchids) and mammals. Removing the habitat that supports these species effectively removes those species from the area. Instead of dozens or hundreds of different types of plants and animals, you're left with just a few -- or, in the case of true monoculture farms, just one.

This type of deforestation is a problem in many parts of the world, but it has become increasingly alarming in coffee-growing regions: On the World Wildlife Fund's list of 50 most deforested areas between 1990 and 1995, 37 were top coffee producers [source: Coffee Habitat]. In Central America alone, more than 2.5 million acres of forest have been cleared for monoculture coffee farms [source: Coffee Habitat].

Besides deforestation and the accompanying loss of biodiversity, the switch from shade to sun comes with some other nasty effects that have become commonplace in modern agriculture. All of those trees and diverse plants that occupy rustic coffee farms have roles in the growing process. The leaves they drop act as mulch, fortifying the soil and protecting it from weeds. Sun-coffee farms have to use chemical fertilizers and herbicides instead.

The thick vegetation in shade-coffee orchards helps protect coffee bushes from destructive insects. Monoculture growers have to use insecticides. And tree root systems prevent soil erosion. Monoculture farms are left unprotected from the erosive effects of wind and rain.

Clearing all that land of indigenous plant life, along with the addition of chemicals to the growing process, necessitates expensive machinery and additional hands to run it, so the whole operation gets more mechanized and complex, which brings with it environmental and economic costs. The problem gets bigger when the chemical fertilizers, herbicides and insecticides used to replace the natural benefits of rainforest leach into groundwater supplies, potentially harming drinking-water sources.

The Arbor Day Foundation estimates that drinking a single cup of shade coffee instead of sun coffee saves about 2.3 square feet (0.21 square meters) of rainforest [source: Daily Green]. But coffee-growing conditions aren't as simple as "sun" or shade." There are shades of gray in between, so it can sometimes be hard to know exactly what you're drinking.

When you buy a bag of "shade-grown" coffee, you may or may not be helping to preserve the rainforest. When it comes to growing coffee, there are different levels of shade, and not all of them are environmentally beneficial.

Coffee cultivation breaks down into several main categories, running from most to least shade:

[source: Coffee Habitat]

Of the five levels of shade, rustic is the most environmentally friendly, with traditional polyculture coming in at a close second. The problem is, some coffee labeled "shade-grown" is actually grown in shaded-monoculture conditions. In Costa Rica, for instance, anything shadier than 100 percent sun is called "shade-grown" [source: Coffee Habitat]. A 10-percent shaded coffee farm may technically be shady, but it wouldn't provide the ecological benefits of traditional growing techniques.

How do you know, then, that what you're buying is really environmentally friendly? As with "organic" labeling, there's a lack of unified "shade-grown" certification criteria in the coffee industry. If you see the certification seal of the Rainforest Alliance or the Smithsonian Migratory Bird Center ("Bird Friendly"), you can be sure you're buying truly shade-grown beans. Audubon Shade Grown Coffee, Arbor Day Foundation coffee, Peace coffee, and Birds and Beans coffee, and Starbucks Organic Shade Grown Mexico coffee are also grown traditionally. (For a more extensive list, see The Daily Green.)

For more information on shade coffee and related topics, look over the links on the next page.