This stone worked just like the one Jon had, but would force the wisher to make an environmentally-friendly wish immediately after a (regular) wish has been granted.
The next morning, Jon woke up. It was a whole new day to try out his newest toy: the wishing stone.
He quickly got ready for school, excited at what the day might bring. When he was finished, he grabbed for the stone and made a wish, not realizing that what he held in his hand was actually The Eco Stone.
"I wish ..."