California regulators voted Tuesday to strengthen state safeguards for thousands of wetlands and streams that are about to lose federal protections in a Trump administration rollback of the Clean Water Act. Nearly 90 percent of California's historic wetlands have been filled in or plowed under, and the state has said it is vital to preserve what remains.

The war on smog has been called one of America’s greatest environmental successes. Decades of emissions-cutting regulations under a bipartisan law — the 1970 Clean Air Act — have eased the choking pollution that once shrouded U.S. cities. Cleaner air has saved lives and strengthened the lungs of Los Angeles children. But now, air quality is slipping once again.

Officials began to clean up a massive oil spill Friday that dumped nearly 800,000 gallons of oil and water into a California canyon, making it larger — if less devastating — than the state's last two major oil spills. The newly revealed spill has been flowing off and on since May and has again stopped, Chevron spokeswoman Veronica Flores-Paniagua said. She and California officials said the spill is not near any waterway and has not significantly affected wildlife. The last flow was Tuesday.