Comment on "Sustainability Strategy for the Cool Copper Collider"

The paper entitled “Sustainability Strategy for the Cool Copper Collider” by M. Breidenbach et al. defines a metric to weigh the electricity consumption and the carbon footprint of future Higgs factory concepts. We show that this metric is flawed in many respects and gives an incorrect representation of reality. We also demonstrates that, irrespective of the drawbacks of this particular estimator, the strategy consisting in using a metric as a multiplicative coefficient of the electricity consumption or the carbon footprint of an ensemble of colliders is fragile at best, and valueless when it comes to arguing in favour of or against such or such future Higgs Factory concept.