translate English to French: Some recent calculations indicate that, between 1850 and the late 1990s, soils in Africa may have emitted 136 gigatonnes of carbon to the atmosphere—equal to half of the emissions linked with fossil fuel combustion—with one third of these soil emissions due to land degradation and soil erosion.
L’Afrique recèle environ 30 pour cent de la dégradation des sols observée à l’échelle mondiale. Cinq cent millions d’hectares y sont moyennement à sévèrement dégradés.