Precisely - lots of different ways, some more efficient than others at this stage of development. And lots more which have never been explored or developed (or like those flywheels in public transport they have been abandoned prematurely), because burning up fossil fuel has always seemed cheaper, since most the cost of the damage caused has never been included in the price paid by the people doing the damage.

A rational accounting system under which those kind of costs had to be included would be the biggest single factor in putting us on the right road.