The UN Convention to Combat Desertification says there is a large and potentially very cost-effective opportunity to sequester a lot of carbon by restoring degraded farmland. This is not planting trees or trying to green areas that were historically desert, but trying to restore areas that used to be productive cropland or grazing land to their original condition or better. It’s also an opportunity to expand food production without displacing productive natural ecosystems.

Rene Castro Salazar, an assistant director general at the UN Food and Agriculture Organization, said that of the 2 billion hectares (almost 5 billion acres) of land around the world that has been degraded by misuse, overgrazing, deforestation and other largely human factors, 900 million hectares could be restored.

Returning that land to pasture, food crops or trees would convert enough carbon into biomass to stabilize emissions of CO2, the biggest greenhouse gas, for 15-20 years, giving the world time to adopt carbon-neutral technologies…

Key to returning dry lands to vegetation is the use of fertilizer, said Mansur. “Fertilizers are essential for increasing productivity. Good fertilizer in the right quantity is very good for the soil.”

Time