> Not only is it thinkable, it could be done responsibly, today.

How?

You have a metro area of 1.3 million which is totally economically dependent on the river. A huge volume of freight moves through the delta daily. Billions of dollars of port infrastructure have been built in New Orleans and Baton Rouge.

Even disregarding the social cost -- which would be huge, given the high levels of poverty in New Orleans -- the pure economic cost would quickly rack into the tens or hundreds of billions. And tens of billions more would be required to make the new course navigable, rebuild port infrastructure, build new cities to serve the port, relocate workers from other parts of the country, etc.

And even then the river could just change its course again in two years or twenty or fifty.