Notre Dame Cathedral was part of Parisian history. It should be rebuilt yet it should have triple roles and not just be a replica museum. Plainly as much of the old stone should be kept and used as a wall in the new steel and glass structure as possible. The new Notre Dame ought to be solar and wind energy productive. A hydrogen fuel cell plant could be primary power and the hydrogen produced from water by monastics.
Some part of the new structure should have a hydroponics farm to grow food year round for the poor. Good eco-structure designers such as are affiliated with Amory Lovins might help design church structures that are reconstructed to be more than museums to the past as if Christian was not a living faith.
Green Notre Dame should surpass the spirit of the Paris accords in exemplary eco-stewardship.