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The document examines the risk of 'sleeper species'—non-native species that remain inconspicuous until environmental shifts, often driven by climate change, trigger rapid population growth. Focusing on the Laurentian Great Lakes, it details how vectors like ballast water and recreational boating introduce these species and highlights the economic and ecological damage caused by examples like zebra mussels and spiny water fleas. The brief advocates for a shift toward prevention and early detection through international collaboration, unified regulatory frameworks for shipping, and citizen science engagement to mitigate the rising costs of biological invasions.