Ken Mak’s greatest wish before leaving his village in Hong Kong this month is to save the fruit trees planted by his grandfather before the bulldozers arrive. To give the trees in Yick Yuen Tsuen in Tuen Mun a second chance, he hit on an idea: tree adoption. Within a week, Mak had recorded the species, height and girth of 53 fruit trees at his family-run flower farm and a nearby church. He compiled the information and photographs into a catalogue and led people on tours to view the trees. So...