Editing Zero emission (section)

==Zero emission engines==
Vehicles and other mobile machinery used for transport (over land, sea, air, rail) and for other uses (agricultural, mobile power generation, etc.) contribute heavily to climate change and pollution, so zero emission engines are an area of active research. These technologies almost in all cases include an [[electric motor]] powered by an energy source compact enough to be installed in the vehicle. These sources include [[hydrogen fuel cell]]s, [[Traction battery|batteries]], [[supercapacitors]], and [[flywheel energy storage]] devices. 

In some cases, such as [[Air engine|compressed air engines]], the engine may be mechanical rather than electrical. This mechanical engine is then powered by a passive energy source like [[compressed air]], or a combustible non-polluting gas like [[hydrogen]].

The above engines can be used in all vehicles, from cars to boats to propeller airplanes. For boats, energy sources such as [[nuclear power]] and [[Photovoltaics|solar panels]] can also be a viable option, in addition to traditional [[sail]]s and [[turbosail]]s.

A concept like [[vegetable oil economy]] produces emissions.