Climate change has shot up the current political agenda in part due to the Extinction Rebellion protests. An urgent question now facing UK policymakers is whether they should accelerate the adoption of cutting-edge green energy technology to curb the country's carbon emissions. But are there dangers of being an early adopter of new technology? What happens if it doesn't work or if it's outpaced by newer technologies which are cheaper and more efficient? The BBC's Business Editor, Simon Jack, investigates.