Four years after the tsunami ravaged much of its northeastern coast and killed over eighteen-thousand people, Japan is constructing a nearly 250-mile chain of cement seawalls to fend off future towering waves. Opponents of the 6.8 billion dollar wall, which in some places will reach nearly five stories high, say that the massive concrete barrier will damage marine ecology and scenery and hinder vital fisheries. Moreover, it will do only little to protect residents, and even worse - it'll foster complacency. Instead, they call for people to either move to higher ground, or to create a "green wall" of trees that perhaps won't stop the floods, but will weaken the impact of the waves. However those in favor of the "great wall", say it's a necessary evil, and one that will provide some jobs, at least for a time.