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Marami silang haka-haka kung ano ba talaga ang rason kung bakit nagging pula ang tubig sa Yangtze River. Ang ilan sa mga haka-haka ay ang mga sumusunod:

1. People have dumped dyes into them

2. Due to incursions of color-producing bacteria that arrive when a body of water has less oxygen than normal

3. An upstream influx of silt

4. Red Clay

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