What Would Nietzsche Do... at Quiet Rest Time?

Yesterday in my class we were discussing Earth Day and ways to help the planet. We had a spirited discussion about recycling, and why it's important to help save our planet.

Me: We need to take care of the Earth. Because if we mess up this Earth, do we get another one?

My students (all together): Nooooooooo....

One student (seriously): Because God is dead.

And yes, I realize that nihilistic German philosophy isn't technically part of the kindergarten teaching standards.