Renault SA is under pressure to quickly find a replacement for Chief Executive Officer Luca de Meo after the shock news of his planned departure, as the industry grapples with rising trade tensions and intense competition from Chinese manufacturers led by BYD Co.

A U.N. push for investment to protect the world's oceans yielded around $10 billion in deals at a conference last week, way below the estimated annual need as many investors seek clearer regulation on...