< PrevNext > 94. WPP London Share 2017 U.S.-Booked Air Volume: $48 millionPrimary U.S. TMC: BCD WPP's U.S.-booked air spend dropped $4 million in 2017, according to a BTN estimate. It employs 134,428 people and operates 3,000 offices in 112 countries. Air travel represented 39 percent of its carbon footprint, producing 89,518 tons of carbon emissions. To reduce emissions, WPP used cost controls and raised its videoconferencing facilities to 700 in 155 cities to decrease air travel by 4 percent. The British multinational advertising and PR company offset its remaining air travel emissions by purchasing carbon credits. WPP revenue rose 6.1 percent to 55.6 billion pounds in 2017, 40 to 45 percent of that from developing markets, according to the company's annual report.