An estimate reported that 100,000 planted trees are required to offset total carbon emissions produced during the entire event, as well as a key sponsor for the event being Chevrolet, promoting a new hybrid four-wheel drive. The BBC cancelled a later major attempt to "raise consciousness" of global climate change. The BBC's news story suggested that this was in part because "poor ratings in the UK and elsewhere for July's Live Earth concert may have confirmed the internal belief that the public do not like being "lectured to" on climate change." DaimlerChrysler used its low-emissions "Smart" car brand while sponsoring the event worldwide. Concert-goers at the event’s London leg had left thousands of plastic cups on the floor of Wembley Stadium, although organisers had urged audience members to use the recycling bins provided, the BBC reported. Al Gore was unhappy with the travel arrangements of the UK band Razorlight. After their appearance at the London Live Earth event, they were ferried to an airport in a large tour bus with a police escort to catch a private jet to Scotland. From the airport in Scotland they travelled by helicopter to Balado to perform at T in the Park. Razorlight claimed they would offset their emissions by planting trees. Singer-songwriter John Mayer, one of the big attractions at the New Jersey/New York concert had not signed Gore's seven-point Live Earth pledge. "If you want to peg me as not being entirely eco-friendly, you'll win," Mayer told reporters after his set. "We're just getting together saying 'We want to be healthier'.” Before the goals of the concerts were announced on June 28, the concert was criticised by Live Aid organiser Bob Geldof and Roger Daltrey of The Who about a lack of a final goal. Geldof said in an interview on 15 May 2007, that the concerts are a waste of time because "Everybody's known about global warming for years." Geldof said he would organise a concert like Live Earth only if he "could go on stage and announce concrete environmental measures from the American presidential candidates, Congress, or major corporations." A spokesman for Live Earth responded to Geldof, saying that the concerts were intended to raise awareness about the dangers of climate change. "People are aware of global warming but millions are not doing anything about changing their lifestyles." The BBC, which televised the concert in the United Kingdom, received a total of 413 complaints because coverage of Metallica's live set was cut short, and approximately 130 complaints concerning swearing as the BBC had shown the concert before the watershed time of 9pm, this includes Chris Rock jokingly calling the crowd "motherfuckers".