JOHANNESBURG — Prime Minister Mark Carney evoked the legacy of Nelson Mandela in praising efforts by fellow leaders to collaborate amid global volatility, as Canada sought more trade partners and promoted multilateralism at the G20 summit in Johannesburg.

“At a time when too many countries are retreating into geopolitical blocs or the battlegrounds of protectionism, Canada believes that the G20 must remain a bridge,” Carney told reporters Sunday.

He cited the legacy of former South African president Nelson Mandela, who spent 27 years in prison for his opposition to the apartheid system of racial segregation. Carney quoted Mandela as saying a societal renaissance required confronting problems that go beyond any one country.

“His words spoke to a moment of rebirth in South Africa, and tod

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