| Autor: |
Bhattarai N; Department of Geography and Environmental Sustainability, The University of Oklahoma, Norman OK 73019, USA.; School for Environment and Sustainability, University of Michigan, Ann Arbor, MI 48109, USA.; USDA-Agricultural Research Service, Beltsville Agricultural Research Center, Hydrology and Remote Sensing Lab, 10300 Baltimore Ave., Beltsville, MD 20705, USA., Lobell DB; Department of Earth System Science and Center on Food Security and the Environment, Stanford University, Stanford, CA 94305, USA., Balwinder-Singh; International Maize and Wheat Improvement Center (CIMMYT)-India Office, New Delhi 110012, India.; Department of Primary Industries and Regional Development, Northam, WA 6401, Australia., Fishman R; School of Public Policy, Tel Aviv University, Tel Aviv-Yafo, Israel., Kustas WP; USDA-Agricultural Research Service, Beltsville Agricultural Research Center, Hydrology and Remote Sensing Lab, 10300 Baltimore Ave., Beltsville, MD 20705, USA., Pokhrel Y; Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824, USA., Jain M; School for Environment and Sustainability, University of Michigan, Ann Arbor, MI 48109, USA. |
| Abstrakt: |
Climate change will likely increase crop water demand, and farmers may adapt by applying more irrigation. Understanding the extent to which this is occurring is of particular importance in India, a global groundwater depletion hotspot, where increased withdrawals may further jeopardize groundwater resources. Using historical data on groundwater levels, climate, and crop water stress, we find that farmers have adapted to warming temperatures by intensifying groundwater withdrawals, substantially accelerating groundwater depletion rates in India. When considering increased withdrawals due to warming, we project that the rates of net groundwater loss for 2041-2080 could be three times current depletion rates, even after considering projected increases in precipitation and possible decreases in irrigation use as groundwater tables fall. These results reveal a previously unquantified cost of adapting to warming temperatures that will likely further threaten India's food and water security over the coming decades. |
