"California legislators aiming to pass more stringent regulations on the sale and dissemination of ivory and rhinoceros horns received a boost last Friday when a San Francisco man pleaded guilty to selling an undercover federal agent two black rhinoceros horns for $55,000. The art dealer Lumsden Quan and Mill Valley man Edward Levine will face sentencing in December."

"Several large solar power plants under construction in the United States have in the past few months promised to do something that none has done before: offer prices equal to or lesser than that of a natural gas-fired power plant, even as gas is abundant and cheap."

"Oil, the lifeblood of many countries that produce and sell it, appears to be rapidly turning into an ever-cheaper economic curse. A year ago, the international price per barrel of oil was about $103. By Monday, the price was about $42, roughly 6 percent lower than on Friday."

"President Obama came to Las Vegas Monday to throw his weight behind the booming solar energy industry in its recent political struggles, and to announce a bevy of initiatives to promote clean-energy growth in America’s homes and on its rooftops. It was the first stop in a climate and energy-focused tour that will also take the president to New Orleans and Arctic Alaska this month."

"HOUSTON — With oil prices collapsing and companies in retrenchment, a federal auction in the Gulf of Mexico on Wednesday attracted the lowest interest from producers since 1986."

"Ten years ago next week, a terrifying hurricane stood perched atop the Gulf of Mexico. Katrina. It had rapidly intensified from a Category 3 into a deadly Category 5 monster and began its northward turn towards the Gulf coast—weakening, fortunately, but still driving a tremendous wall of water."

"The impact of low oil prices could have long-term consequences for drilling companies. But hydraulic fracturing technology could allow the industry bounce back more quickly, experts say."

"The business lobby is ramping up efforts to sack a controversial air pollution rule from the Obama administration."

"There could be half a billion reasons for the concessions President Barack Obama’s clean-power plan made to a defiant energy industry."