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10 billion global population 'unsustainable'

OSLO: US special climate envoy John Kerry told Agence France-Presse (AFP) that the world's population will not be tenable in 2050, when it is projected to hit nearly 10 billion, but refrained from asking Americans to give up steaks.

Since November, the global population has officially crossed 8 billion, more than three times the figure in 1950.