"That they are the most carbon efficient doesnt mean it couldnt be improved/replaced in the future however." The fact that transporting things by sea is ORDERS

"That they are the most carbon efficient doesnt mean it couldnt be improved/replaced in the future however." The fact that transporting things by sea is ORDERS OF MAGNITUDE more efficient means that it is the last thing to improve-replace. "I just find it funny how politicians in my country try to save carbon emissions by enforcing a speed limit on highways or only let newer cars into the city areas...it just doesnt make no difference at all on a global scale." Politicians use to be ignorant of science. Having said that, cars and trucks are the biggest polluter in the world. I couldn't care less about "carbon emissions", but combustion particles, specially diesel from big truck, are really nasty for the environment.