Are longer, healthier lives for more humans worth the sacrifice of an impoverished biosphere? And most importantly, how will your conclusions about those questions shape the way that you live your life? Thanks for watching, I'll see you next week. Crash Course is produced and directed by Stan Miller. Our script supervisor is Danica Johnson. The show is written by my high school history teacher Raoul Meyer and myself, and our graphics team is Thought Bubble. Last week's Phrase of the Week was Mario and Luigi.