The planting of so-called “fertilizer trees,” indigenous tree species that draw nitrogen from the air and replenish the soil, has significantly improved the crop yields in five African nations over the last two decades, researchers say.
Since the 1980s, when the World Agroforestry
Safely getting rid of what we flush away each day is the unglamorous role of the wastewater treatment plant. But a new process that turns sewage into high-quality fertilizer proves that creative minds can find inspiration for innovation just about anywhere.
Municipal facilities, such as Clean Water
San Francisco’s new food recycling program — the first in the U.S. that requires all food waste from homes, apartments, businesses, and restaurants to be recycled and composted — has been enthusiastically embraced by city residents, officials say.
Although the program was officially launched on Wednesday, city officials say that residents have been recycling food for weeks and are already setting aside about half of the city’s 500 tons of daily food waste.