You know, our home planet.
After all, it has now been established that parts of "the" Earth are rocks from Mars.
And some speculate that life on Earth was seeded from Mars.
In which case all living things on this planet are really invasive exotic alien species which have infested the Earth.
In other Earth Day News:
Our president took his 747 on an Iowa expedition
to talk about keeping carbon footprints low.
If your mission is lower emissions,
a cross-country trip is the way to go!