Harvard's Czeisler, perhaps the leading expert on sleep and productivity, points out that while corporations have policies
around harmful practices such as smoking and drinking, they tacitly encourage long hours unrelieved by sufficient rest.
Indeed, while some have pointed fingers at pollution and construction of dams — the Yangtze is home to the world's largest — mostly to blame are local fishing
practices that sustain millions of people
around the Yangtze but which involve
harmful gill nets, rolling hooks or electrical stunning.