our planet is a delicate flower

"This planet is not terra firma. It is a delicate flower and it must be cared for. It's lonely. It's small. It's isolated, and there is no resupply. And we are mistreating it. Clearly, the highest loyalty we should have is not to our own country or our own religion or our hometown or even to ourselves. It should be to, number two, the family of man, and number one, the planet at large. This is our home, and this is all we've got."

— Scott Carpenter, Mecury 7 astronaut, speech at Millersville University, Pennslyvania. 15 October 1992.

http://www.spacequotations.com/earth.html