For years, green waste such as shrubs, cuttings and plant remains from parks, fields and football stadiums have ended up on massive trash heaps in South Africa’s biggest cities. But a local company has found an innovative way to deal with the problem. It converts the piles of garbage into microbiological compost. That’s good news for landowners, who can use the cheaper and more sustainable compost as fertilizer on their fields. And most importantly, composting carries significant benefits for the climate. Decaying trash releases massive amounts of methane gas into the atmosphere, a pollutant that is 20 times more harmful for our environment than carbon dioxide. A film by Mabel Gundlach