In the transport sector, despite a number of political initiatives, the energy demands as well as greenhouse gas emissions are growing at an alarming speed. This holds true especially for road and air transport. Recent volatility in oil prices as well as the corresponding political instabilities...

Unlike oil and coal, which are compressed forms of energy, renewable energy requires unusually large land areas. This article calculates the consequences of a switch to hydrogen-cell vehicles powered by electricity from wind turbines. It then re-does the calculation for three other green energy...