impact of its manufacturing activities on the environment and climate change. In the jewelry and watchmaking industries, there are general concerns over the lack of transparency in manufacturing activities and the sourcing of precious raw materials, such as gold, which is a major cause of environmental issues, such as pollution, soil degradation and deforestation. The situation is especially serious in the developing countries which are top producers of gold, including China, Russia and South Africa. It is estimated that the watch and jewelry sector uses over 50% of world's annual gold production (over 2,000 tons), but in most cases the watch companies are not able to or are unwilling to demonstrate where their raw materials come from and if the material suppliers use eco-friendly sourcing technologies. Notable patrons and owners TAG Heuer, in keeping with its image as a luxury brand with an innovative spirit, has long-standing links with the world of sport and Hollywood. The brand has had a long list of sports and Hollywood ambassadors. In addition, TAG Heuer has paid numerous celebrities to endorse its products, including: Tom Brady, Ayrton Senna, Kevin Richardson, Cristiano Ronaldo, Chris Hemsworth, Jessica Michibata, Tiger Woods, Leonardo DiCaprio, Brad Pitt, Sarah Fisher, Louis Koo, Chen Daoming, G.E.M. Tang, Jeff Gordon, Maria Sharapova, Jeremy Lin, Juan Pablo Montoya, Kimi Räikkönen, Uma Thurman, Fernando Alonso, Lewis Hamilton, Max Verstappen, Sergio Pérez, Therese Johaug, Shah Rukh Khan, Priyanka Chopra, Cameron Diaz, Sydney McLaughlin, Steve McQueen, Ranbir Kapoor, Mary Kom, Alexander Rossi and Li Yifeng. Steve McQueen wore a blue Monaco in the 1971 movie Le Mans (this model is now referred to as the "McQueen Monaco"), and Swiss Formula One star Jo Siffert customarily wore a white-dialed Autavia with black registers. In 1974, Heuer produced a special version of the black-dialed Autavia that was offered by the Viceroy cigarette company for US$88. This version of the Autavia was called the "Viceroy" and advertisements for this promotion featured racer Parnelli Jones. Sponsorship TAG Heuer has been the official timekeeper of the three Summer Olympic Games of the 1920s, the Skiing World Championships, the Formula One World Championships and has developed a watch for the McLaren F1 team. Heuer was the official timepiece of the Ferrari F1 team in the 1970s and McLaren from the 1980s until 2015. TAG Heuer is the official time keeper and sponsor of La Liga, Bundesliga, Ligue 1, Serie A, J1 League,