【推荐2】Coffee grown worldwide can date back to the ancient forests of Ethiopia. There, legend says the goat herder Kaldi first discovered coffee bean after he noticed that after eating the fruits from a certain tree, his goats became so energetic that they did not want to sleep at night. Coffee trade began on the Arabian Peninsula. By the 16th century it was known in Persia, Egypt, Syria, and Turkey.

Coffee was hardly known in Europe before the 17th century. The Venetians were the first people to bring coffee into Europe. The first European coffee houses started opening in Italy around 1645. In the following 100 years, at least 3000 coffee houses were operating in England. It was the coffee houses of England that started the custom of tipping waiters and waitresses. In a short time, coffee and coffee houses spread throughout Europe. In 1822, a Frenchman Louis Bernard Rabaut invented a machine which forced the hot water through the coffee grounds using steam instead of merely letting it drip through. The first espresso machine (咖啡机) had been born.

In the coffee industry, there are two important coffee species — Arabica and Robusta. Arabica originates from the coffee trees discovered in Ethiopia. It represents about 70% of the world’s coffee production. Arabica coffees bring the highest prices on the world market. Meanwhile, these coffee trees require additional care and attention. Robusta is primarily used for instant coffees. The Robusta bean itself tends to be slightly rounder and smaller than an Arabica bean. It can produce a coffee which has a distinctive taste and about 50-60% more caffeine. The Robusta tree is more resistant to disease, which makes it easier and cheaper to grow.

To preserve coffee beans’ fresh roasted flavor as long as possible, you can store them in an air-tight container (容器) at room temperature. Coffee beans can be beautiful, but avoid clear containers which will allow light to influence thee taste of your coffee. Exposure to air is bad for your beans. If you do freeze your beans, be sure to use a truly air-tight container.

【推荐3】Climate change is causing more areas to turn into deserts. This issue is affecting the lives of 250 million people as land that used to be good for farming becomes dry and unproductive. Around one-third of the world’s land is impacted, including regions in Africa, southern Europe, Asia and America.

Sand to Green is a Moroccan company that can transform a patch of desert into a sustainable (可持续的) and profitable plantation in five years, according to Wissal Ben Moussa, its co-founder and chief agricultural officer. The solution is using agroforestry (农林业)to create a new kind of agriculture that is sustainable and that can be resilient (有适应力的) in front of climate change.

The system can be set up close to any source of salty water, which Sand to Green cleans using energy from the sun. It then grows different types of fruit trees and plants together in the same area—a method called mixed planting—and waters the plants’ roots directly with the cleaned water, to reduce water loss to the air. The soil is regenerated using what Sand to Green calls “green manure”, a mixture that includes compost, biochar(生物炭)and microorganisms that help the soil “wake up”. Biochar is a form of charcoal that can help dry soil hold on to water.

In a five-hectare trial in southern Morocco that’s been running since 2017, Sand to Green has tried out a variety of plants in search of the best performers. Among the intercropping herbs (草本植物) that have been successfully trialed are rosemary, geranium, vetiver and citronella, which Ben Moussa describes as “very low-maintenance and very high-profit”.

Sand to Green is now working to scale up to a 20-hectare commercial site, also in southern Morocco. It says a site of that size would cost around $475,000 to set up and would start bringing financial returns in about five years.

According to Ben Moussa, with this system they create biodiversity, which means better soil, healthier crops and a bigger yield. The plantation can generate 1.5 times more yield, thus making more money than a farm that grows only one type of crop in the same space.