This study by the World Agroforestry Center shows that almost half of the world's farmland has at least 10 percent tree cover. Says that farmers would do more to preserve trees if their trees were included in international climate change negotiations mitigation schemes.

This study used farmer-survey data, remote sensing, and hydrological modeling of the prevalent cropping systems to investigate the importance and role of the poplar trees within the agricultural landscape, and to estimate their water use. It was found that trees are currently grown on approximately 10% of the irrigated lands, which are located within the study area in northern India.

This study used farmer-survey data, remote sensing, and hydrological modeling of the prevalent cropping systems to investigate the importance and role of the poplar trees within the agricultural landscape, and to estimate their water use. It was found that trees are currently grown on approximately 10% of the irrigated lands, which are located within the study area in northern India.