California's efforts to get residents and businesses to voluntarily use less water have not been enough in the face of a historic and ongoing drought. Now mandatory emergency rules that come with penalties have been enacted, requiring towns and cities to cut use from 8 to 36 percent. Gwen Ifill learns more from Felicia Marcus, chair of the California State Water Resources Control Board.

There has been a sharp increase in the number of earthquakes in Oklahoma in recent years. Some observers have suggested the rise of oil and gas drilling is responsible. The state’s government, however, hasn’t acknowledged that link until now. Gwen Ifill talks to Joe Wertz of StateImpact Oklahoma about the connection.

Five years after the explosion on BP's Deepwater Horizon oil rig in the Gulf of Mexico 40 miles off the coast of Louisiana, the Obama administration is proposing new regulations for offshore oil rigs that would improve safety standards for blowout preventers to hopefully avoid similar catastrophic oil spills. The explosion on BP's rig in April 2010 killed 11 men and began the largest oil spill in U.S. history. Nearly 5 million barrels of oil leaked into the Gulf of Mexico before the oil well...

The Supreme Court heard arguments over federal pollution mandates. The EPA says its limits on toxic contaminants like mercury in power plant emissions are vital to human health, but energy producers are arguing the EPA didn’t take costs into consideration when the limits were created. Gwen Ifill gets debate from Vickie Patton of the Environmental Defense Fund and David Rivkin of BakerHostetler.

On the Webcast Extra, Bloomberg’s Jeanne Cummings breaks down the “delicious story” of the downfall of Rep. Aaron Schock (R-Ill.) after his resignation from Congress when stories of questionable expenditures arose following his Downton Abbey-themed office. The Justice Department and FBI have started a criminal inquiry. John Harwood of CNBC details President Obama’s fracking initiative.

A bill approving the construction of the Keystone XL pipeline was the first order of business for the Republican-led Congress this year, and today that bill was vetoed by President Obama. Gwen Ifill gets two views from Jeremy Symons of the Environmental Defense Fund and Robert Bryce of the Manhattan Institute.

Since last year’s Detroit Auto Show, gas prices have dropped by nearly a third. With the new lower prices, demand has gone up for big new SUVs and sedans, but automakers have also switched gears to develop more fuel-efficient cars. Gwen Ifill speaks with John Stoll of The Wall Street Journal about the tension between the two trends and convincing car buyers to think long-term.

After a grand jury decided not to indict police officer Darren Wilson in the death of Michael Brown, we look at what’s next as the issue of race and justice continues to capture national attention. Also, the surprise resignation of Defense Secretary Chuck Hagel after less than two years. Plus, we hear from our viewers on key issues like Washington gridlock, healthcare and the environment.