"The U.S. and Mexico reached an agreement Monday to cooperate on oil and gas development in the Gulf of Mexico. Signed at a meeting in Los Cabos, Mexico, the agreement would set a process that U.S. companies and Mexico's state-owned Pemex could use to jointly develop waters that straddle the nations' maritime border. It also would provide for the U.S. and Mexican governments jointly to review applications and safety inspections in cases of drilling in the boundary-straddling waters, where oil spills could affect both nations."

"Mexico's oil regulator is sounding an alarm over plans by the country's state oil monopoly to drill two ultra-deep-water wells near U.S. waters this year, saying neither the company nor his commission is prepared to handle a serious accident or oil spill there.

"MONTREAL -- The transboundary movement of spent lead-acid batteries in North America has environmental and public health consequences to communities in Mexico that are the subject of a new investigation by the Secretariat of the Commission for Environmental Cooperation, CEC."

"A drought that a government official called the most severe Mexico had ever faced has left two million people without access to water and, coupled with a cold snap, has devastated cropland in nearly half of the country."

"Sea currents act like a conveyor belt, depositing trash on a remote stretch of sand in an ecologically rich region of coral reef and mangrove forests. Locals can only pick up the pieces, bit by bit."

"Mexico’s Laguna Region is famed as the country’s largest milk-producing area. But overexploitation of groundwater resources has combined with the effects of climate change to give the region a more dubious distinction. The remaining water supplies are contaminated with arsenic, and related rates of cancer are well above the national average."

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"MEXICO CITY — Mexico’s social development secretary says an estimated 600,000 households suffered property damage or crop losses due to an unusual combination of floods, drought and freezing weather in 2011. Heriberto Felix Guerra says the drought has been so bad that about 2.6 million people in about 1,650 villages and towns in northern Mexico do not even have drinking water."

"NAUCALPAN DE JUÁREZ, Mexico — The spent batteries Americans turn in for recycling are increasingly being sent to Mexico, where their lead is often extracted by crude methods that are illegal in the United States, exposing plant workers and local residents to dangerous levels of a toxic metal.

"TUCSON -- For the first time since 2009, a jaguar has been found roaming the wilds of southern Arizona. The jaguar was photographed by a hunter on Saturday and confirmed by the Arizona Game and Fish Department to be a roughly 200-pound male in good condition."

"LINCOLN, Neb. -- The closing of the country’s last meat processing plant that slaughtered horses for human consumption was hailed as a victory for equine welfare. But five years later just as many American horses are destined for dinner plates to satisfy the still robust appetites for their meat in Europe and Asia."

"Hundreds of police raided illicit markets to crack down on the lucrative trade in wild animals and rare flowers, arresting 15 traffickers across Mexico this weekend in one of the biggest swoops of its kind."

"An environmental advocacy group filed a lawsuit Monday against the U.S. section of the International Boundary and Water Commission, saying the federal agency tasked with managing the Rio Grande refused to release status reports, flood maps and plans."

"TIJUANA — A ruptured sewage pipe in Playas de Tijuana that led Baja California health authorities to close beaches—and raised concerns that the contamination also could affect ocean water quality north of the border—has been fixed, authorities said Thursday."

Water shortages in the Southwest may be postponed for a while after Mexico agreed to store some of the Colorado River water it is entitled to in U.S. reservoirs while it repairs canals and pipelines damaged in a recent earthquake.

"At least 28 people have been killed and many others injured in an oil pipeline explosion in central Mexico, officials say."