| A | B | 
| pollution | things we do to increase our carbon footprint | 
| electrolyte | located between the anode (-) and cathode (+) | 
| combustion | burn fossil fuels for power, contributes to pollution | 
| catalyst | used to coat the electrolyte | 
| efficient | how much of the energy you get back that it stored in the fuel | 
| compress | to be pushed together (like hydrogen and oxygen) | 
| capacity | how much something can hold | 
| mass production | making many of the same item, typically on an assembly line |