Environment

California voters approved Prop. 4's $10 billion in bonds for environmental projects, with about $2 billion going toward protecting drinking water.

The golden mussel’s appearance in the Sacramento-San Joaquin Delta is its first confirmed detection in North America — and it has the potential to clog major water supply pumps.

The slowdown comes as the governor lauds his record as tough on oil companies. His administration requested several more years to force companies to detect and fix leaks.

Low counts of spawning salmon could mean another year without fishing. Experts say the outlook still has time to turn around.

Inland communities with big population booms will experience the most extreme heat days under climate change projections. The combination puts more people at risk — and many cities are unprepared.

Bikers — many of whom love their noisy combustion engines — say zero-emission motorcycles aren’t ready for long-distance rides. Motorcycles emit an “outsized portion” of smog-causing pollutants.

The state air board will vote on changes to its landmark clean fuel program that would cut more greenhouse gases but could raise the cost of gas and diesel.

Growers support a federal and state proposal for operating California’s massive systems that send river water south. But it could harm more salmon and other endangered fish.

Capturing and storing carbon underground is a big part of California’s efforts to tackle climate change but community members and environmentalists say it prolongs the life of fossil fuels.

Immigrants, tribes and other people of color rely on fish from San Francisco Bay and Delta rivers. California faces a federal discrimination probe for failing to protect them.