What do considering and taking into account its footprint mean? Do we need to reduce its price energy consumption?

Why is using a proof of stake based protocol preferable over a proof of work protocol of using a proof of work protocol is not harmful? Why is energy cost important? Have you considered that the cost of energy is the foundation of bitcoin price in an incentive-based economy? Do you understand that if fewer miners are needed, decentralization cannot happened, therefore the ultimate goal of a decentralized economy dies right there?