2022年1月25日 · According to GFSAD estimates, there were 1.873 billion hectares of net agricultural cropland around the world in 2015, which is about 15% of Earth's ice-free land. About 400 million of these hectares are irrigated, according to Thenkabail's analysis. The GFSAD project is a collaborative effort between the USGS, NASA, Bay Area Environmental ...