Once again, burning the fuel at a power plant and delivering electricity to the train is considerably more efficient than burning fuel in the train.
Running natural gas through a fuel cell is cleaner and more efficient than burning it, even in a modern combined-cycle gas plant.
It may also help to tell them that if they eat small frequent meals, it will speed up their metabolism and allow more efficient fat burning to occur.
But in other places, propane or other fossil fuels, or simply a more efficient stove for burning wood, may be the right choice.
For black carbon the measures are largely in the form of more efficient ways of burning things; for ozone they mostly involve reducing emissions of methane, which encourages reactions in the atmosphere that make ozone.
No wonder the governments of coal-rich countries are content, the firms that dig it up are rubbing their hands, while the users are looking hard for more efficient ways of burning the stuff.On the supply side, prospects have been transformed.
For example, biogas provides a more efficient and cleaner burning alternative to biomass (wood, charcoal, dung), effectively reducing harmful emissions and fuel consumption.
Get much closer and you'll find researchers trying to better understand how modern car engines work, which they hope will help find cleaner, more efficient ways of burning petrol and diesel.
Once that solution is acceptable, can a more efficient way of burning bodies in the Auschwitz crematoriums, be far behind?
