For the first time in recorded history, endangered sea turtles are nesting on the West Coast of the United States, with two individuals laying eggs at Huntington Beach and Seal Beach in Southern California. Driven northward by the warming Pacific waters of a developing 'Super' El Niño, these tropical creatures have crossed a biological threshold that scientists have never before documented on this coastline. Their presence is less a triumph than a signal — a visible inscription on the sand of forces that operate at planetary scale, reminding us that the boundaries governing where life can exis