Its very hard to know who is being the most energy efficient , in many decisions one makes.
Buy a new car that used a lot of energy in manufacture, or keep the old one though less fuel efficient, is just one example.
I applaud people who try to conserve energy, but it is difficult to see what difference its going to make in the grand scheme of things, when the majority of people and countries are using energy as if they don t care.
And how many people are using aeroplanes, using vast amount of fuel?
A lot of this conservation is cosmetic.
Aeroplane's emissions are a bit mis-leading. I remember seeing an advert by Ford in an US airport saying that a jumbo got 5mpg where as their SUV got 23mpg.
Bit misleading as an aeroplane carries far more people than an SUV so is more fuel effecient in transporting people.
However the problem with aeroplanes is that they thier emissions at such an altitude that they compound the green house effect.