Argument: Since the world's population in the developed countries will not increase until 2040 according to United Nations, the annual growth rate in passenger kilometers will decrease compared to the last 40 years. Out of the atmosphere travel will be available around 2010 (apart from the few "tourists" that have been away so far).

Questions: 3.5% of the human-induced global warming originated from aviation according to the Intergovernmental Panel on Climate Change (IPCC). What fuel will be the common one in 2040, oil, alcohol, hydrogen, biodiesel, or a combination?

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