In the second of a two-part series on the economy as Hong Kong marks 29 years since its return to Chinese rule, Lo Hoi Ying and Leopold Chen look at the city’s efforts at closer integration with the nation and the opportunities and obstacles it presents. Part one can be found here. A question from his niece about how face masks should be recycled prompted materials scientist Eddie Yu to rethink sustainability and inspired him to develop biodegradable materials when he started his company,...