An ecologist is giving a speech and says, “If we continue on our current course all life
on earth will be gone in 50 years.” A man in the audience stands up and hysterically
asks, “What?! What did you say?!”
He repeats, “If humanity stays on its current course every living thing
on earth will be gone in 50 years.”
The man is relieved and sits down saying, “Whew.
I thought you said FIFTEEN years.”