Optimization of UAV–UGV Last-Mile Collaborative Delivery under Dynamic Carbon Footprint Constraints: Visual Simulation and Scenario Analysis of Coordinated Air–Ground Unmanned Delivery System. GHSS [Internet]. 2026 Aug. 18 [cited 2026 Aug. 24];7(4):287-306. Available from: https://ojs.bonfuturepress.com/index.php/GHSS/article/view/2052