The process is claimed to be environmentally friendly, since the only significant byproduct is water.

Human waste was the only byproduct not sent back to the States for recycling.

The car's only byproduct is water which, is made when the hydrogen from the fuel cell contacts the oxygen from outside.

The only byproduct, officials say, is hot water.

There's a lot to like about fuel cells, as they're quite efficient and, when fueled with hydrogen, produce water as the only byproduct.

The only useful byproduct, perhaps, is that we get to see who's uncomfortable with concepts, or who oughta' be given a pulpit.

With either method, the only byproduct from the spent hydrogen is water, however during combustion with air NOx can be produced.

Frustration has not been the only byproduct of unemployment for Ms. Kerin.

Burning hydrogen to power a car produces no carbon dioxide; the only byproduct is water.

The ions and the electrons are recombined in a reaction with oxygen to form water, the only byproduct if pure hydrogen is used.