The encyclical letter Laudato Si is available here on the Vatican website. And though addressed to all persons, this section will carefully address how believers, not just Christians, can look to their God-given responsibilities for the planet as well as for the more needy among us:
64. Furthermore, although this Encyclical welcomes dialogue with everyone so that together we can seek paths of liberation, I would like from the outset to show how faith convictions can offer Christians, and some other believers as well, ample motivation to care for nature and for the most vulnerable of their brothers and sisters.
Pope Francis appeals to his sainted predecessor for an assist here:
If the simple fact of being human moves people to care for the environment of which they are a part, Christians in their turn “realize that their responsibility within creation, and their duty towards nature and the Creator, are an essential part of their faith”.[John Paul II, Message for the 1990 World Day of Peace, 15: AAS 82 (1990), 156] It is good for humanity and the world at large when we believers better recognize the ecological commitments which stem from our convictions.