Many opera companies are working towards full sustainability, and Glyndebourne is among those aiming to be a force for good, according to a new documentary.

A night at the opera is not typically equated with restraint, instead conjuring images of chandelier-filled theatres and arias performed in exquisite costumes against transportative stage sets. Yet, recent years have seen opera companies across the globe make a determined effort to operate more sustainably, implementing numerous strategies in a bid to reduce their carbon emissions and overall impact on the planet.