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The Mississippi river could be called America鈥檚 inland hydro highway. It carries US goods and commodities out to the rest of the world and allows trade flows to return. But up and down the Mississippi River, there are new pressures. The strain on the river system is only becoming more acute with the impacts of climate change. Reporter Jason Margolis recently traveled nearly 1800 kilometres down the Mississippi to assess the health of the river, its economy and its people.

(A fish is pulled from the Mississippi River near Baton Rouge, Louisiana. Further south, oysters thrive in brackish water, a mix of freshwater and saltwater in coastal Louisiana. Credit: Leyland Cecco/The World)