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From Billie Eilish in New York to BTS in Seoul and Elton John in Paris, one of the biggest-ever international charity exhibitions was scheduled for Saturday with shows around the world to increase awareness on climate change, vaccines equality and famine.
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Concerts are started to broadcast worldwide from London, Lagos, Rio, Sydney, Mumbai and more, planned to exist side-by-side with the UN General Assembly this week.
Eilish, Coldplay and Jennifer Lopez will perform in New York's Central Park, where Britain's Prince Harry and Meghan Markle will be present on the stage.
Stevie Wonder will perform in Los Angeles, while Ed Sheeran will headline in Paris alongside Elton John, Black Eyed Peas and Stormzy.
Tens of thousands of watchers are due to visit the biggest concerts, on the condition of vaccination proof or negative Covid tests.
There will also be pre-recorded treats from BTS in South Korea, Green Day in Los Angeles, DJ superstar Alok in Rio, Kylie Minogue in London and Andrea Bocelli in Tuscany.
"Across six continents, artists will help rally citizens in demanding that governments, important firms and philanthropists work together to protect the planet and defeat poverty," NGO Global Citizen said in a statement.
It said it was concentrating "on the most urgent, interrelated threats hitting those in poverty the hardest -- climate change, vaccine equity, and famine".
A group of other artists -- including Metallica and The Weeknd -- are also included, either through live or recorded performances.
Global Citizen said it wants one billion trees planted, one billion vaccines distributed to the poorest countries and meals for 41 million people on the brink of famine.
The organisation have targeted other high-profile charity events, comprising "Vax Live: The Concert To Reunite The World" earlier this year in Los Angeles, that brought musicians, actors, celebrities, world leaders and even the pope, in a collective call for global vaccinations to fight Covid-19.
Global Citizen portrays itself as an action with a mission to end extreme poverty by 2030.
Its app uses encouragements such as concert tickets to encourage users into pressuring governments on problems around sustainability and equivalence.
Tickets to Saturday's events were allocated free of charge to randomly appointed people who enrolled for the app and shared its invitations and messages on social media.
The head of the World Health Organization, Tedros Ghebreyesus, gave his assistance to the latest campaign, encouraging vaccine equality.
"We now face a two-track pandemic of haves and have-nots," he said.
"We cannot disregard this gross inequity or become complacent."
One performer who almost had to cancel was Elton John, who this month announcing he was delaying the rest of his touring dates for this year following a hip injury.
But he said he would wait until after the Global Citizen Live gig for his operation "as I don't want to let a charity down".