Coffee and the environment

Changes in how coffee plants are grown has resulted in effects on the environment.

Traditionally coffee plants were grown under the shade of trees, which provided natural habitat for many animals and insects, roughly approximating the biodiversity of a natural forest. The trees provided a moderate climate for the plants, and leaves that dropped from the shade trees enriched the soil. Farmers also used compost coffee pulp before chemical fertilizers were available. They also typically rotated crops and cultivated food alongside their cash crops, which provided additional income and food security.

However, in the 1970s and 1980s, during the "Green Revolution," the US Agency for International Development and other groups gave $80 million to plantations in Latin America for advancements to go along with the general shift to technified agriculture. These plantations replaced their shade grown techniques with sun cultivation techniques to increase yields, which in turn destroyed vast forests and biodiversity.

Sun cultivation involves cutting down trees, and high inputs of chemical fertilizers and pesticides. Environmental problems, such as deforestation, pesticide pollution, habitat destruction, soil and water degradation, are the effects of most modern coffee farms, and the biodiversity on the coffee farm and in the surrounding areas suffer.

As a result, there has been a return to both traditional and new methods of growing shade-tolerant varieties. Shade-grown coffee can often earn a premium as a more environmentally sustainable alternative to mainstream sun-grown coffee.

Another issue concerning coffee is its use of water. According to New Scientist, it takes about 140 litres of water to produce one cup of coffee, and the coffee is often grown in countries where there is a water shortage, like Ethiopia.

Cultivation of Coffee throughout the world

Coffee is usually propagated by seeds. The traditional method of planting coffee is to put 20 seeds in each hole at the beginning of the rainy season; half are eliminated naturally. Coffee is often intercropped with food crops, such as corn, beans, or rice, during the first few years of cultivation.

The two main cultivated species of the coffee plant are Coffea canephora and Coffea arabica. Arabica coffee (from C. arabica) is considered more suitable for drinking than robusta coffee (from C. canephora); robusta tends to be bitter and have less flavor than arabica. For this reason, about three-quarters of coffee cultivated worldwide is C. arabica. However, C. canephora is less susceptible to disease than C. arabica and can be cultivated in environments where C. arabica will not thrive. Robusta coffee also contains about 40–50 percent more caffeine than arabica. For this reason, it is used as an inexpensive substitute for arabica in many commercial coffee blends. Good quality robustas are used in some espresso blends to provide a better foam head and to lower the ingredient cost. Other cultivated species include Coffea liberica and Coffea esliaca, believed to be indigenous to Liberia and southern Sudan, respectively.

Most arabica coffee beans originate from either Latin America, eastern Africa, Arabia, or Asia. Robusta coffee beans are grown in western and central Africa, throughout southeast Asia, and to some extent in Brazil. Beans from different countries or regions usually have distinctive characteristics such as flavor, aroma, body, and acidity. These taste characteristics are dependent not only on the coffee's growing region, but also on genetic subspecies (varietals) and processing.Varietals are generally known by the region in which they are grown, such as Colombian, Java, or Kona.

The Anotomy of a Coffee Plant

The Coffea plant is native to subtropical Africa and southern Asia. It belongs to a genus of 10 species of flowering plants of the family Rubiaceae. It is an evergreen shrub or small tree that may grow 5 meters (16 ft) tall when unpruned. The leaves are dark green and glossy, usually 10–15 centimeters (3.9–5.9 in) long and 6.0 centimeters (2.4 in) wide. It produces clusters of fragrant, white flowers that bloom simultaneously. The fruit berry is oval, about 1.5 centimeters (0.6 in) long,and green when immature, but ripens to yellow, then crimson, becoming black on drying. Each berry usually contains two seeds, but from 5 to 10 percent of the berries have only one; these are called peaberries.Berries ripen in seven to nine months.