Life on earth, existence has great meaning and significance, especially as a Christian, so it must be known and fulfilled. As it is written in Genesis "... you will be shepherds, administrators of the creation of the world; you will have charge of those whom God has created". Christians contribute to the perfection of the world... Catechesis on Christian Commitments and the Environment, in collaboration with P. Tina Jeannot Ranaivozanany.