The authors says
“It is argued here that the key challenge for CRE is the development of new more efficient and profitable technologies. This is to be accomplished via an improved science-based scale-up methodology for transfer of molecular discoveries to sustainable non-polluting processes that can meet the future energy, environmental, food and materials needs of the world”
But as pointed out by the author, it is more challenging to develop technologies keeping in mind the environmental effects, future food, energy and material needs. For any technology to survive, the main driving force is money. This is very much true for countries like us, where there is least awareness of many important issues, other than economic development.