, figuerres wrote

*snip*

the headline is an attention grabber ....

it coud also be "water makes electricity"   as reading the story it's saying they are getting the hydrogen -  and that will burn to run an engine....

normally the cost of that has not made it worth while so far but ....

Why not?  I've always wondered why we couldn't float a solar panel contraption in the sea to harvest (slowly) the O2 and H2 gasses that would come off of it.  It wouldn't have to be that efficient as long as we get more energy from the collected gasses than it takes to produce the contraption to capture them for later.  If it were possible, the all we need to do is repeat the process a few billion times.