That would be one that tries to reduce its transport and energy needs in the first place (ideally at script stage), and then finds ways to decarbonise – either through green tariffs for mains power or by using renewable alternatives for location power. There would be a zero to landfill policy in place, making sure as much as possible is prepared for reuse, and that waste is sorted into different streams and recycled as much as possible. The ‘end life’ would be considered for every item purchased for the shoot, from large set builds, to drives, batteries and croc clips. And lastly, making sure that all the materials brought into the production are coming from sustainable sources in the first place!