Well, like I said, we’re already expected to be good stewards of creation. So if the Pope wants to stick the word “ecology” in the catechism, it won’t be a change. Much ado about nothing.
Edited to add, I also always wonder whether the Pope has had some experiences with rich people in his native country or in South America generally that cause him to be a bit out of touch with the fact that many if not most Catholics are already doing the stuff he exhorts us to do, like care about poor people, care about the earth, etc. It’s not a bad thing to get a reminder, and of course we can always do a little more, but he seems to emphasize stuff we already do, a lot.