Today in Focus

The race to succeed Jeremy Corbyn as leader of the Labour party has been narrowed to five candidates this week. Political editor Heather Stewart looks at the challenge ahead for the party as it faces five more years of opposition. Plus: John Abraham on the historic warming of the oceans. Help support our independent journalism at <a href="https://www.theguardian.com/infocus">theguardian.com/infocus</a>

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