"MEXICO CITY -- The stunning and little-understood annual migration of millions of Monarch butterflies to spend the winter in Mexico is in danger of disappearing, experts said Wednesday, after numbers dropped to their lowest level since record-keeping began in 1993."

"Seventeen foundations controlling nearly $1.8 billion in investments have united to commit to pulling their money out of companies that do business in fossil fuels, the group plans to announce on Thursday."

"WASHINGTON -- The National Security Agency monitored the communications of other governments ahead of and during the 2009 United Nations climate negotiations in Copenhagen, Denmark, according to the latest document from whistleblower Edward Snowden."

"ESSEX JUNCTION, Vt. (AP) — Vermont beekeepers face mite infestations, extreme temperature swings and the possibility of colony collapse. Last fall, a new threat emerged: zombie bees."

"Scientists and biotechnology companies are developing what could become the next powerful weapon in the war on pests — one that harnesses a Nobel Prize-winning discovery to kill insects and pathogens by disabling their genes."

"HAZARD, Ky. — Joseph Nantz still looks back fondly at his job as a heavy machinery operator at the mountaintop coal mine here, helping to blast and cart away layers of rock to reveal seams of coal and then restore the rubble for a handsome $24 an hour."

"As much as he was known around the world as a troubadour of idealism, Pete Seeger was at bottom a plain-spoken citizen of Beacon, N.Y."

"WASHINGTON -- Leaders of the House and Senate agriculture committees are optimistic that the long-overdue U.S. farm bill will pass, although the House of Representatives vote set for Wednesday could be the more difficult hurdle."

"During President Obama’s speech tonight, he announced many different ways he would use the executive branch to pursue strong action on climate change. For longtime readers, this is old hat by now; I’ve been over how the EPA can use its pollution authority to cut back on carbon emissions several times. The policy framework hasn’t changed."