The encyclical letter Laudato Si is available here on the Vatican website.
Noting that “Nothing in this world is indifferent to us,” Pope Francis sets to explore this statement in this paragraph and the three that follow. He reminds us Saint John XXIII addressed the issue of peace two generations ago:
3. More than fifty years ago, with the world teetering on the brink of nuclear crisis, Pope Saint John XXIII wrote an Encyclical which not only rejected war but offered a proposal for peace. He addressed his message Pacem in Terris to the entire “Catholic world” and indeed “to all men and women of good will”.
Remember, we explored this document together here. Is the situation with the Earth’s environment as grave? Just as Pacem in Terris was addressed widely beyond the bounds of Catholicism, the issue before us merits a wide audience, a broad conversation, and a worldwide discernment.
Now, faced as we are with global environmental deterioration, I wish to address every person living on this planet. In my Apostolic Exhortation Evangelii Gaudium, I wrote to all the members of the Church with the aim of encouraging ongoing missionary renewal. In this Encyclical, I would like to enter into dialogue with all people about our common home.
The fuss about the address to non-Catholics with language not always explicitly Christian is an empty criticism. From the very start, Pope Francis sets no bounds with readers. He expects a wide and attentive audience, and seems little concerned about first laying out the parameters of his and the Catholic understanding of the environment.