The biggest traditional Catholic environmental thing is our heritage of prayers and blessings for animals, plants, the weather, and so on. We also have a lot of traditions, regional and worldwide, which tie the Church’s calendar to making the whole year sacred.
Priests and religious who say the Office/Liturgy of the Hours are always singing and reciting the “Canticle of the Three Children” from Daniel 3 and the many nature psalms, which point out the obedience, order, and beauty of Creation. Job and a lot of other Scriptures get into this also, and Jesus is obviously pretty knowledgeable about nature as well as being able to command it as its Lord. Scripture also looks forward to “the lion and the lamb” peaceful nature of the new heaven and the new earth.
We traditionally had the Rogation Days, which were specifically prayers for the land and weather, and the Ember Days, which tied fasting for repentance to prayers for the world. Most areas also celebrated feastdays of saints which were tied to the important climate turns of the year, wild animals which were hunted or which could hunt you, livestock and crops, visits to the woods and gathering wildflowers or herbs, and so on.
It was very common that saints were interested in the natural world, both studying it and taking care of it. St. Francis was just one of many. Having the ability to tame wild animals or for animals to pay attention to you was considered fairly common among certain kinds of saints, as a reflection of both Eden and the new heaven and earth to come. During their lives, many saints healed or treated wild animals and livestock as well as people; and there are many patron saints of animals and plants, or against animal and plant diseases and injuries.
Since “the earth is the Lord’s, and all that is in it,” it has always been foolish, according to Jewish and Christian teaching, to act toward the natural world in a greedy or crazily wasteful and destructive way. We do not worship or serve Nature; but we look after the non-rational creatures as part of our service to God. We are certainly allowed to “kill and eat,” as the Lord told Peter, but as God’s stewards, we will have to render him an accounting of how we have used His creatures.