"Four U.S. airlines temporarily suspended flights to and from Mexico City on Thursday after a volcano 50 miles from the capital spewed ash, a spokesman for the city's international airport said."

"MEXICO CITY -- Fed up with oil spills from facilities belonging to Mexico’s state oil company Pemex, residents of two communities in the southeastern state of Tabasco are taking the country’s largest company to court in a bid for compensation for damage to the environment and agriculture."

"Pacific Gas and Electric Co. could face a record fine for a deadly 2010 natural gas pipeline explosion in a San Francisco suburb. Officials hope it will help prevent future accidents while some warn that rising natural gas demand is outpacing investment in energy infrastructure."

"CUCAPÁ EL MAYOR, Mexico — Germán Muñoz looked out at the river before him and talked about the days when dolphins swam here, 60 miles from the sea."

"...Over the past couple of years, the number of monarch butterflies that reach the Mexican sanctuaries has been declining, generating concern among rural communities that rely on spillovers of butterfly tourism activities, as well as entomologists, biologists, ecologists and monarch aficionados around the world. ..."

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"Little more than a year after making it to the top of IBM's list of worst commuter cities, Mexico City has returned to the urban transit spotlight -- this time at the receiving end of international praise."

"MEXICO CITY -- A gas buildup under a building in the headquarters of Mexico's state oil company caused a blast that killed 37 people and wounded dozens, the attorney-general said Monday, ending days of near-total silence by authorities about the petroleum giant's worst disaster in more than a decade."

"MEXICO CITY -- An explosion rocked the headquarters of Mexico's state-run oil monopoly Pemex, killing 25 people, injuring 101, and damaging three floors of Mexico's second tallest building before sending plumes of smoke into the Mexico City skyline."

"The megacity's water shortage could be eased by an aquifer a mile under the surface of Iztapalapa, a neighborhood whose terrible water quality is the butt of local jokes."