Waiting for a 'unicorn technology' that provides green energy at low cost could be more expensive than adopting low-carbon energy technologies now.  Researchers from Imperial College London say if Britain invested more in today's low-carbon energy technologies, it would save more money in the long term than waiting for a mythical future technology that may never materialise.  Waiting for a 'unicorn technology' that provides green energy at low cost could be more expensive than adopting low-carbon energy technologies now.  Researchers from Imperial College London say if Britain invested more in today's low-carbon energy technologies, it would save more money in the long term than waiting for a mythical future technology that may never materialise.  