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The transportation sector accounts for about 28% of the greenhouse gas emissions in the United States. Barge shipping could help reduce that output, but there鈥檚 not a full picture of how carbon efficient that transportation mode really is.

Changing rainfall amounts, soil conditions and river levels all complicate the situation, which kicked off with a stretch of dryness this spring.

It鈥檚 a newer consideration for environmentalists, who previously thought that river systems were relatively benign and don鈥檛 contribute many greenhouse gas emissions.

The 11th annual Mississippi River Cities and Towns Initiative meeting comes at a critical moment when a changing climate is ratcheting stress on the nation's largest river network.

River enthusiast Dean Klinkenberg is convinced 鈥淪t. Louis deserves a marina.鈥�

U.S. Sens. Josh Hawley and Roy Blunt want the U.S. Army Corps of Engineers to stop focusing on protecting wildlife in the Missouri River and instead focus鈥�