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Passage: Glacial melt in northern Pakistan has accelerated in recent decades, initially increasing river flow but raising long-term concerns about future water supply once the glaciers substantially shrink. Scientists also warn of glacial lake outburst floods, sudden and destructive events triggered when meltwater breaches natural ice or debris dams. Monitoring systems have been installed in several high-risk valleys to detect early warning signs. Question: What is the main idea of the passage?
A. Accelerated glacial melt brings both short-term water gains and long-term risks ✅
B. Glaciers in Pakistan are no longer melting
C. Glacial floods are entirely unpredictable and unmonitored
D. Water supply concerns have already been resolved
