Certain elements of today's ecological crisis reveal its moral character. First among these is the indiscriminate application of advances in science and technology. Many recent discoveries have brought undeniable benefits to humanity. Indeed, they demonstrate the nobility of the human vocation to participate responsibly in God's creative action in the world. Unfortunately, it is now clear that the application of these discoveries in the fields of industry and agriculture have produced harmful long-term effects.
Pope John Paul III cannot fail to note once again that the poor constitute the modern challenge, especially for the well-off of our planet, where millions of people live in inhuman conditions and many are literally dying of hunger. It is not possible to announce God the Father to these brothers and sisters without taking on the responsibility of building a more just society in the name of Christ.
Pope John Paul II'Lord you know that I love you...Lord, you know that I love you' (Jn 21:15-17). The Eucharist is, in a certain way, the culminating point of this answer. I wish to repeat it together with the whole Church to Him, who manifested His love by means of the Sacrament of His Body and Blood, remaining with us 'to the close of the age'
Pope John Paul II