The 65 year-old former Beatle has been discussing the possibility of performing at the London concert, which will take place at Wembley Stadium on July 7.
Former American Vice President Al Gore himself approached McCartney after learning that the singer and musician was a fan of his documentary, An Inconvenient Truth.
A source told Britain’s Daily Mirror, "It’s true that Paul has been asked to take part. He said the cause is very close to his heart and he has been impressed with what Gore has been doing to highlight it, but he’s still deciding."