Great Lakes: Hydrology, Ecology, and Transboundary Management

Status: draft · Confidence: medium (0.625) · Basis: verified_sources

Quality notes: placeholder_content

## TL;DR

Great Lakes: largest surface freshwater system on Earth — 84% of North America surface freshwater, 21% of world total (22,671 km³). Shared US-Canada. 40M drinking water, $7B fishery. GLWQA 1972/2012 governs binational management.

## Core Explanation

Lake stats: Superior (82,100 km², deepest 406m), Erie (shallowest 64m, eutrophic), Ontario (244m). Invasive: zebra mussels ($5B damage), sea lamprey, Asian carp threat. 2014 Toledo water crisis: Lake Erie microcystin bloom. IJC (1909 Boundary Waters Treaty). Great Lakes Compact 2008 prohibits water diversions. Lake effect snow: 200-750 cm/yr downwind.

## Detailed Analysis

[待后续补充。]

## Further Reading

- [Source 1 — Great Lakes: Hydrology, Ecology, and Transboundary Management](https://www.epa.gov/greatlakes)

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