The U.S. Geological Survey has recorded seven small earthquakes shaking central Oklahoma in a span of about 14 hours.

The frog made famous in a tale by Mark Twain is now California's official state amphibian.

A proposal to the California Air Resources Board, up for approval in September, would allow Sacramento Valley rice farmers to sell carbon emission offsets as part of the state’s effort to combat climate change. Rice farmers would flood their fields for shorter periods to reduce the decomposition process that emits methane – a potent greenhouse gas.

The California Supreme Court has agreed to decide an epic battle over whether the state must condemn and acquire parcels on tens of thousands of acres of private property to conduct preliminary testing for Gov. Jerry Brown’s proposal to construct two large water-conveyance tunnels in the Sacramento-San Joaquin Delta.

Months after the prairie began to shake, scientists still struggle to explain a surge in Kansas earthquakes that appears connected to increased fracking.

State officials Wednesday adopted emergency regulations to streamline enforcement of water-rights curtailments during the drought. But the State Water Resources Control Board agreed to exempt senior water rights from the new rules.

California officials are struggling to get water agencies and diverters to comply with recent orders to stop drawing water from streams amid the drought. Only 31 percent have complied.

As California officials struggles to develop strategies and approaches for conserving water for residents and companies in the state parched by another year of drought, other government entities as well as individuals have taken steps to reduce water consumption. Here are many resources geared toward ensuring we don’t go totally dry before the rains return.

What makes one type of fireworks safe for consumers and another a hazard? Is the common sparkler just as dangerous as a Roman candle? You might be surprised.

With the heightened sensitivity of an election year and the expansion of the carbon program looming, critics are redoubling their opposition. The California Independent Oil Marketers Association, an industry group, has organized Fed Up at the Pump, which describes itself as a “grass-roots coalition of consumers, businesses, and advocates.”

These are days of sweet vindication for Neil Koehler, a Sacramento business executive who has spent his career pursuing a single goal: to get Americans to pump more ethanol into their gas tanks.

Like an urban tumbleweed caught by a coastal breeze, ordinances banning thin plastic shopping bags have reached the Sacramento region.

Two types of non-native water snakes have gained a foothold in the Sacramento region, and scientists fear their spread could imperil endangered native species.

Thousands of Californians who rely on water diverted directly from streams are starting to feel the pain from water-rights curtailments ordered by the state. One example is the small community of Outingdale in El Dorado County, where residents are limited to 68 gallons of water a day per person – about a third of the state average.

With the governor’s controversial Delta tunnel project a key part of the debate, lawmakers on Monday failed to advance a leading Senate proposal to put a revised water bond on the November ballot.

A recently completed inventory of tricolored blackbirds has found a steep drop in the birds’ spiraling population statewide, with scientists worrying that this year’s drought will lessen future populations.

Four administrators of the U.S. Environmental Protection Agency who served under Republican presidents told a Senate panel Wednesday that climate change is real and the federal government has the responsibility and the legal authority to combat it.

Federal officials on Tuesday boosted water releases into the American River, despite the ongoing drought, because they are fighting to keep salinity from San Francisco Bay out of the Delta.

The Sacramento region as a whole has made strides to accommodate this year’s severe drought, cutting overall water use 18 percent compared with the past two years, according to the Regional Water Authority.

State officials are evacuating fish from hatcheries on the American River because of the drought. Water temperatures are expected to become too warm to keep the fish alive in coming weeks.

Several hundred brown and white goats, including a few spindly-legged kids, grazed lazily on a grassy hillside one day last week. It was a pastoral scene, but for the 250-foot pile of garbage 18 inches beneath the goats’ hooves.

A Bay Area water agency may use its water contracts on the Sacramento River for the first time to help its customers survive the ongoing drought.

Hydraulic fracturing or “fracking” is a method of extracting oil and gas that are inaccessible by conventional drilling. Fracking has become increasinly common over the past decade and accounts for a large proportion of oil and gas production in the United States. Fracking involves freeing the gas or oil trapped in non-permeable layers of shale by fracturing the layer, thus freeing up the gas or oil. Click the button to begin the process:

Today, California's Sierra Nevada - one of the world's great mountain ranges - is suffering a slow death. Almost everywhere there are problems: polluted air, dying forests, poisoned rivers, vanishing wildlife, eroding soil and rapid-fire development. Even Muir's holy ground, Yosemite National Park, is hurting: Much of its forest has been damaged by ozone.

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