After Japan's devastating 2011 tsunami, volunteers have planted more than 680,000 trees to protect the coast from future tsunamis

• In the years since, Japan has invested billions of yen in massive concrete seawalls, but another, less conventional form of protection has also taken root.
• Across the country's Pacific coast, volunteers have planted more than 680,000 native trees as part of the Chinju no Mori Project, an ambitious effort inspired by ancien