A mysterious figure comes down to earth and says we must eat all of the Vatican or else humanity dies. We have 1 month. Can we do it?

We have to eat everything that’s attached to the ground. Buildings, plants, statues, etc.

We can use spices and sauces if we want. Doesn’t matter how, we just gotta eat it.

If we can’t do it in 1 month, how long would we need?

Extra points: we have to also eat the pope and anyone who is employed by the church. They can fight back, but can’t leave the city. We are rewarded by setting climate change back to however it was back in the 1400s.