If you are going to restore 24 million hectares of degraded land, a lot of things need to go right. Sub-Saharan countries Burkina Faso, Cameroon, Ghana and Kenya plan to have that much land on track to being restored by 2030. While several components of the plan are in place, many others are not. Perhaps the most pressing is how to source and plant enough material from native tree species seeds, seedlings and other material like cuttings.
At a red-brick factory in the German port city of Hamburg, cocoa bean shells go in one end, and out the other comes an amazing black powder with the potential to counter climate change.