Pet Shop Boy Neil Tennant is the latest in a long line of stars to question the motives of the Live Earth concerts, which are due to take place on Saturday July 7. Tennant admitted he's feeling "uneasy" about the concerts, which aim to raise awareness of global warming issues across the world. "The Princess Diana concert is fair enough, but I feel more uneasy about the Al Gore thing [Live Earth]," Tennant said. "I've always been against the idea of rock stars lecturing people as if we know something [other people] don't. It looks arrogant. It's not as if we have a private source of information. To state the obvious as if you are the only person that knows it is intellectually weak." Tennant also slammed U2 frontman Bono for his methods of charity work. "Bono uses his celebrity, but in doing so he increases his celebrity. I'm never even totally convinced that the rest of U2 feel comfortable with that."