The are talking about biofuel. The point is that no matter what you want to do, there is no point in doing it by artificial synthesis. You can always engineer o

The are talking about biofuel. The point is that no matter what you want to do, there is no point in doing it by artificial synthesis. You can always engineer one of the many bacteria/algae/whatever already present in nature, modifying something that already does what you want to achieve, just making it better.