 US star Lenny Kravitz is scheduled to play in Brazil on Saturday |
A spokesman for the global event said producers for the show indicated they were proceeding with the open-air concert on Copacabana Beach.
The Brazilian gig is the only free event in the series of eight worldwide concerts to highlight climate change.
The Rio line-up includes Lenny Kravitz, Macy Gray and Pharrell Williams.
Guarantee
Aside from the US acts, Rio will play host to a number of native performers, including singer Xuxa, reggae rock band O Rappa and rapper Marcelo D2.
A giant beach stage in front of Rio's Copacabana Palace hotel has already been erected, with organisers hoping to attract up to one million visitors.
Brazilian prosecutor Denise Tarin had requested a suspension of the concert saying security efforts by police would be concentrated on preparations for the Pan American Games, starting 13 July.
Local promotion company Mondo Entretenimento sought to allay fears, saying it had plans to use dozens of observation towers and platforms, as well as police cameras, as part of the security scheme for the event.
Concert organisers said they received guarantees of security and safety at the event from Rio police, but they are still asking the court to reconsider its decision.
The Istanbul leg of the Live Earth series of concerts was shelved last month due to a lack of interest and sponsorship.
Eight cities will be holding concerts across 24 hours on 7 July, including London, Tokyo, Sydney and Johannesburg.