WATCH: Pharrell Williams, Al Gore announce ‘Live Earth’ concert plans

ABOVE: Watch former U.S. vice president Al Gore and singer Pharrell Williams announce plans for a Live Earth concert.

DAVOS, Switzerland — Pharrell Williams says he’ll have all of humanity singing together at a worldwide concert June 18 to fight global warming.

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The pop superstar is teaming with Nobel Peace Prize-winner Al Gore to produce a Live Earth concert on seven continents to build support for a U.N. climate pact in Paris among more than 190 nations in December.

On a stage Wednesday at the World Economic Forum in Davos with producer Kevin Wall, Williams said “we literally are going to have humanity harmonize all at once” in support of a binding international accord to limit heat-trapping greenhouse gas emissions.

He said the purpose is “to have a billion voices with one message – to demand climate action now” from governments rather than to continue the world’s reliance on fossil fuels.