The core business of the Lufthansa Group is the transportation of our passengers. The most significant effects on the environment therefore result from our flight operations. For our flights we need kerosene, combustion of which produces carbon dioxide (CO2) and other emissions (such as nitrogen oxides and unburned hydrocarbons). For every tonne of kerosene that we conserve, 3.15 fewer tonnes of CO2 are released into the environment. Accordingly, we have been directing our environmental protection efforts towards continual improvement in fuel efficiency and, ultimately, a reduction in the size of our CO2 footprint. Management of energy and resources on the ground and in our catering, our involvement in research, and active noise protection are important areas where we can apply these efforts. Energy efficiency in flight operations is of considerable relevance to our success in terms of economic and ecological criteria. Fuel costs across the Group as a whole now account for more than 22% of our operating costs and therefore constitute an important cost factor for the Lufthansa Group. Success- fully implemented measures to lower fuel consumption therefore have an especially positive effect on our corporate success while at the same time improving both our results and our environmental balance sheet. The Lufthansa Group is committed to making mobility, now and in the future, as environ- mentally compatible for its customers as possible. We see the constant growth in the need for mobility worldwide as a particular challenge to this commitment. This trend is being intensified mainly by the increasing need for mobility in the newly industrialized countries. According to a prognosis made by the Inter- national Air Transport Association (IATA) in December 2013 (Airline Industry Forecast 2013–2017), passenger volume will increase by 31% worldwide by 2017. The number of passengers, accordingly, is expected to increase from 2.98 billion in 2012 to 3.91 billion in 2017. This is equivalent to an annual growth rate of 5.4%. During the period from 2012 to 2013, the number of passengers Strategy and management Furthering mobility responsibly The Lufthansa Group’s corporate management practices are guided by values, and central to those practices is a sense of responsibility for the climate and environment. To achieve steady reductions in the effects our business operations have on the environment, we make as efficient use of the resources we need as possible. Energy efficiency in flight operations is of considerable relevance to our corporate suc- cess in terms of eco- nomic and ecological criteria. 46 // Climate and Environmental Responsibility