I downvoted you because your comment doesn&#x27;t contribute anything useful to the discussion.  Barring some kind of technological silver bullet, &quot;saving the planet&quot; is ultimately a problem of politics and economics.<p>The next problem, of how we can maintain our lifestyle without breaking the emission limits that we set, is what inventions like this one help with.  I expect that piston engines will continue to have some applications for as long as I&#x27;m alive, so improving them is a good thing.