High above the Earth in a precise Sun-synchronous orbit, a satellite born of two nations' ambitions has begun to speak — and what it says concerns the health of the planet itself. Nearly a year after its launch, the NISAR mission's S-Band radar has transmitted its first images, rendering glaciers, mangroves, river basins, and wetlands with a clarity that transforms climate concern into measurable fact. This is not merely a technical milestone; it is the opening of a sustained, all-weather vigil over Earth's most vulnerable systems, one that will accumulate into a record of planetary change for