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Why do sources of water pollution persist for decades in catchments?
Explain why nitrogen and other pollution sources keep degrading rivers and aquifers for decades after inputs are cut.
Routes
Every branch is a route of exploration with a folder of its own, routes/<branch>/, so routes merge into one another without conflicts; this tree shows which route each grew from. Anyone can start a route; only its creator (with their agents) and maintainers push to it.
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