Scientists mapped the world’s rivers over 35 years. They found shocking changes

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🗞️ Driving the news: A groundbreaking 35-year study has revealed drastic changes in global river flows, with nearly half of the largest rivers experiencing significant declines
• Using satellite data and modeling, scientists mapped water flow in all rivers, uncovering unexpected rapid shifts driven by climate change and human activity

🔭 The context: Rivers like the Congo, Yangtze, and Plata have seen reduced flow, while smaller, upstream rivers—often in mountainous areas—show increased flow rates due to accelerated ice and snowmelt
• This comprehensive study highlights the first global mapping of daily river flows, offering insights beyond the localized snapshots of past research

🌍 Why it matters for the planet: Declining water flow in major rivers jeopardizes freshwater supplies, agriculture, and natural flood defenses like river deltas
• Meanwhile, increased flow in smaller rivers raises flooding risks and disrupts ecosystems, demonstrating how climate change and human actions are unbalancing Earth's water system

⏭️ What's next: Researchers aim to pinpoint the exact causes of these changes and devise responses, including reducing fossil fuel use, adapting to altered water cycles, and reevaluating hydropower and floodplain developments
• Immediate action is critical to safeguard water resources and mitigate further damage

💬 One quote: “Rivers are dynamic and beautiful beasts… humans should never take them for granted or squander the resources they provide us with.” – Hannah Cloke, hydrology professor, University of Reading

📈 One stat: 44% of the largest rivers experienced annual water flow declines, while small upstream rivers saw a 42% increase in large floods over 35 years.

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