The pressures from global warming and high oil price attract
the worldwide concerns to prevent the serious impacts on both
the economic growth [1–7] and the environmental pollution
[8–14]. Population growth has significantly increased the demand
for energy. The total supply of primary energy reaches 12.15 billion
tons of oil equivalents to support the world population of 6.8 billion
in 2009 [15]. This supply satisfied the demands from international
aviation, international marine bunkers, electricity generation and
heat trade. The total supply of primary energy is projected to
increase 1.5% annually, which may reach the demand of 17 billion
tons of oil equivalent by 2030 [16]. However, the world energy
supply still heavily relies on the fossil based resources.