New Orleans residents brace for salt water intrusion as Biden declares national emergency

President Joe Biden on Wednesday declared a federal emergency for a saltwater intrusion in the Mississippi River, which is threatening New Orleans' water infrastructure. A lack of rainfall has led to lower levels of fresh water in the Mississippi River, which has allowed the denser saltwater layer beneath to rise upstream over the past two months. Usually, the strength of the river flow in tandem with an underwater sill work to keep the saltwater at bay. But on Monday, the saltwater overtopped the sill, entering the drinking water of Plaquemines...