Elevated CO₂ Increases Cadmium Bioavailability in Paddy Soils via Soil Acidification and DOM Transformation - Hongyan Yu; Zuyu An; Xulei Geng; Yunlong Han; Jinyan Lan; Yanxun Qiu; Xuejia Bai; Xingchen Hao; Yue Teng (Water, Air, & Soil Pollution, 2026)