PDO‑Locked Southwest Drought

New climate‑model synthesis suggests the Pacific Decadal Oscillation may move into a long negative phase amplified by global warming, locking the U.S. Southwest into multiple decades of drier conditions and negligible recovery even with episodic wet years. If true, longstanding water allocations (e.g., Colorado River compacts), agricultural planning, urban growth, and hydropower assumptions will require reworking on a multi‑decadal basis. — A persistent, model‑driven shift in a major climate mode creates high‑stakes political and economic choices about rationing, infrastructure investment, interstate compacts, and climate adaptation funding.