OPEC chief fuels oil investment debate

From the BBC World Service: In an exclusive interview, the Secretary General of the oil producers cartel OPEC warns of “dire consequences” for the global economy if investment in the oil sector falls. Crisis-hit Chinese property giant Evergrande saw its shares jump when it resumed trading in Hong Kong, but its future is unclear. And the BBC’s Paul Kenyon tracks down one of the so-called “dark fleet” ships carrying Russian oil, despite G7 sanctions.