Sustained deoxygenation in global flowing waters under climate warming.

Of 21,439 studied river reaches, 78.8% of them (7.4 × 10 5 km) exhibited a decreasing trend, and 33.0% (3.2 × 10 5 km) were statistically significant ( P < 0.05), while only 2.2% (1.7 × 10 4 km) showed significantly increasing trends ( Fig. 1B ).

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