地理漫步·世界地理英语30篇（1）

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五大湖水道与“铁锈地带”的工业遗产

The Great Lakes hold 21% of the world’s surface freshwater and link eight U.S. and two Canadian states.
Their deep, navigable channels enabled bulk transport of iron ore, coal, and steel since the 19th century.
Cities like Cleveland, Detroit, and Chicago grew as industrial hubs along lake ports and rail junctions.
Pollution from heavy industry degraded nearshore ecosystems, especially in Lake Erie during the 1960s.
Since the Clean Water Act and binational agreements, water quality has improved significantly in most lakes.
Invasive species like zebra mussels entered via ballast water and now reshape benthic food webs.
Renewable energy projects and green manufacturing are reshaping economic geography around the lakes.
Glacial till plains surrounding the lakes provide fertile soils for corn and soybean agriculture.
Lake-effect snow creates microclimates that influence settlement patterns and infrastructure resilience.
Today, the lakes support both legacy industry and emerging knowledge economies in connected metropolitan regions.