Like all the effects of climate change, there are ways our inventive species is trying to adapt. New salt tolerant crops (quinoa anyone?), and creating easements to protect the new marshland that was once farmland.
Two great reads to help get a handle on the crisis -
"Coastal farmers in Maryland and across Mid-Atlantic being driven off their land as salt poisons the soil" - Baltimore Sun
A fascinating interactive map and photo essay showing the impact of salt water on the Eastern Shore's Fields and Forests - "Our Changing Chesapeake"