On a small scale there is the 7th Century Irish saint Fiacre, the patron of gardeners. He is traditionally celebrated on September 1st.
But if we're going to go all in celebrating green things and mighty mountains, the Bear suggests a suitable symbol. Something untamed, majestic, even fierce. Something like, oh, a Bear. Nature in microcosm, no?
Perhaps you all could compose panegyrics to the Bear. Make offerings. And the Bear, in turn, would take all that positive energy and direct it toward healing the planet according to the... er, mystical Bear traditions.
The Bear sees merchandising. The Official Vatican Mascot of the First Nature Worship Day. The Bear will be expecting a cut, of course.
Bear worship has a long and distinguished history way back to caveman days.
|Hey, it's the thought that counts.|
Just tell us where the asherah poles go.