People check the semi-processed biochar at a farm near Windhoek, capital of Namibia, on Oct. 8, 2020. A group of Namibian farmers are changing the face of farming in the normally infertile soils of the desert that characterizes the Southern African country through the use of biochar as a form of natural fertilizer. (Photo by Musa C Kaseke/Xinhua)

Farm workers use a grinder to process the biochar at a farm 40 km from Windhoek, capital of Namibia, on Oct. 8, 2020. A group of Namibian farmers are changing the face of farming in the normally infertile soils of the desert that characterizes the Southern African country through the use of biochar as a form of natural fertilizer. (Photo by Musa C Kaseke/Xinhua)

A farmer plants beetroots in a nursery at a farm near Windhoek, capital of Namibia, on Oct. 8, 2020. A group of Namibian farmers are changing the face of farming in the normally infertile soils of the desert that characterizes the Southern African country through the use of biochar as a form of natural fertilizer. (Photo by Musa C Kaseke/Xinhua)

A farm worker applies biochar in the field during a demonstration at a farm 40 km from Windhoek, capital of Namibia, on Oct. 8, 2020. A group of Namibian farmers are changing the face of farming in the normally infertile soils of the desert that characterizes the Southern African country through the use of biochar as a form of natural fertilizer. (Photo by Musa C Kaseke/Xinhua)

A man demonstrates the biochar production at a farm 40 km from Windhoek, capital of Namibia, on Oct. 8, 2020. A group of Namibian farmers are changing the face of farming in the normally infertile soils of the desert that characterizes the Southern African country through the use of biochar as a form of natural fertilizer. (Photo by Musa C Kaseke/Xinhua)

A man demonstrates the biochar production at a farm 40 km from Windhoek, capital of Namibia, on Oct. 8, 2020. A group of Namibian farmers are changing the face of farming in the normally infertile soils of the desert that characterizes the Southern African country through the use of biochar as a form of natural fertilizer. (Photo by Musa C Kaseke/Xinhua)