We could decide to dig big inland seas using nuclear weapons. We'd essentially create Mediterranean Sea habitat across southwest by bringing up the Gulf of Cali

We could decide to dig big inland seas using nuclear weapons. We'd essentially create Mediterranean Sea habitat across southwest by bringing up the Gulf of California (what forms Baja) at Puerto Penasco and creating lots of internal coastal areas with ready access to fresh water. I would guess it could take 5-10 years for the earth moving, and 20-30 for detox, and 20-30 more years for habitat re-equilibration.