The Intergovernmental Panel on Climate Change [1] has declared that "warming of the climate system is unequivocal" and concluded that most of the observed increase in global average temperature since the mid-20th century is the result of human activities that are increasing greenhouse gas (GHG) concentrations in the atmosphere.The IPCC [1] further projected that the pace of climate change is going to accelerate with continued GHG emissions, and that even if atmospheric concentrations of GHGs were stabilized at current levels, the Earth would continue to warm as a result of past GHG emissions and feedbacks in the global climate system [2].The IPCC [1] suggests that even if CO 2 emissions decline by 85% (of 2000 emissions) by 2050, average global warming is likely to remain between 2.0ºC and 2.4ºC by the end of the century [2].Hence, global atmospheric concentrations of carbon dioxide (CO 2 ) should be kept below 450 ppmv. In order to achieve this, a reduction of GHG emissions by about 80% is required by 2050 for developed economies, while at the same time room for development for developing countries is created.Pol. J. Environ. Stud. Vol. 25, No. 5 (2016), 1975-1984
AbstractIn this paper we confront widely accepted global climate stabilization goals (70% reduction of CO 2 emissions) with the International Civil Aviation Organization's (ICAO) forecasts of future commercial aviation growth, in order to explore the real possibilities of realizing these climate stabilization goals. By using ICAO forecasts, we clearly show that, instead of the proclaimed 70% reduction of CO 2 emissions, air transport's CO 2 emissions are going to rise five-fold (4.9 times) in the 2005-40 period. But even if a 70% increase of aviation's energy efficiency and reduction of CO 2 emissions could be somehow (miraculously) achieved, CO 2 emissions of air transport would be higher by 50% in 2040 (than in 2005), due to the sudden increase in the volume of air-transport tourist trips. So, if the aim is to achieve ambitious energy consumption and GHG reduction for air transport within the next few decades, policies should aim at reducing total consumption, which means reducing VKT -not just vehicle-specific consumption. Due to the extremely high growth rates in the volume of air traffic, it is highly unlikely that technical progress of engines will be sufficient to reduce overall emissions or even keep them at today's levels. Hence, the policy focus should shift to more rigorous and efficient implementation of market-driven instruments, which, apart from creating incentives to develop and use low-emission technologies, can also reduce the demand for travel.