For the first time, ProPublica has cataloged cleanup efforts at the 50-plus sites where uranium was processed to fuel the nation’s nuclear arsenal. Even after regulators say cleanup is complete, polluted water and sickness are often left behind.

Shell and ExxonMobil are selling their California wells despite oil selling at high prices. Experts say one reason is looming liability for environmental cleanup.

In a Q&A, experts describe how a new climate reality threatens the Southwest, the fastest-growing region in the U.S.