Aashi Agarwal Net zero has become one of those terms that gets attached to an event the way “artisanal” gets attached to a snack: often, and with very little consistency about what it actually requires. A conference with a tree-planting partnership calls itself net zero. A festival that buys offsets for its stage power calls itself net zero. A concert that has genuinely redesigned its energy, waste and mobility systems also calls itself net zero.