Some Christian churches have started to celebrate Earth Day Sunday this coming Sunday. Mostly it is a movement among mainstream Protestant churches, although in some Evangelical churches it is taking hold.
There are a couple of passages from the Catechism on this topic. "Man must therefore respect the particular goodness of every creature, to avoid any disordered use of things which would be in contempt of the Creator and would bring disastrous consequences for human beings and their environment." (#339) "The seventh commandment enjoins respect for the integrity of creation. Animals, like plants and inanimate beings, are by nature destined for the common good of past, present, and future humanity. Use of the mineral, vegetable, and animal resources of the universe cannot be divorced from respect for moral imperatives. Man's dominion over inanimate and other living beings granted by the Creator is not absolute; it is limited by concern for the quality of life of his neighbor, including generations to come; it requires a religious respect for the integrity of creation." (#2415)
So we share, to some degree, in these concerns. We have a responsibility for being good stewards of creation, though at the same time avoid giving creation more than its due. The article speaks of "revering" the earth, and I'm not convinced that's appropriate. The earth should not be revered as if it were superior to us or due some form of worship or veneration. Perhaps in a simple sense, it should be respected, in the sense that we should be aware of it, and how it works, and not trample upon it or abuse it.
Back in my Evangelical days I took a dim view of ecology, as was the fashion in my circles at the time. (To be honest I can't even remember the arguments against ecology anymore.) I even looked at recycling with suspicion, thinking it was a New Age plot. (I was big into New Age plots.) Now I'm a rather aggressive recycler, though more from a practical standpoint ("This stuff is perfectly useful if reused! Why waste it?") than from a stewardship perspective.
The other component has to do with consumption. The fact is that we in the West do consume a disproportionate share of natural resources. Anything we can do to not waste resources (he says, as he remembers his habit of leaving lights on all over the place, though that has its reason) is good.
But this Sunday is a bad Sunday for Earth Day Sunday; it conflicts with Mercy Sunday and Easter (Octave). I expect it's to coincide with Earth Day, although the official Earth Day site says it is on the vernal equinox. I suppose if you assume worst case that the Sunday following Earth Day is Easter, you can't have Earth Day Sunday on Easter, so they took the next available day, the Sunday after Easter. Oh well. Not that I think we should necessarily celebrate it. I'm not sure we should mix secular political causes into our calendar. But it is a subject at least worth bringing up, as long as it doesn't devolve into Gaia-worshipping. ("Oh Gaia — they treat you like dirt!" ;-))