I'm honestly a little surprised that mine got accepted since it didn't REALLY have any actual clean up the planet message.
The piece that I was originally working on for this collab was a city park scene but the more I worked on it, the less I liked how it was looking until I eventually just dumped it in the projects folder and quickly threw together the toon frog pond from an old sketch I had in my doodles folder with the justification being that keeping a clean yard and making a little watering hole for the neighborhood frogs can SORTA be seen as cleaning up the planet.
But I'm rambling, anyway everyone's entries look great (and are ACTUALLY Earth Day themed) and thanks for having me : )