"MEXICO CITY — Deforestation is down in the Mexican forest that is the winter home of Monarch butterflies, and scientists also hope to see a rebound in the annual migration after it fell to historic lows last year, an expert said Thursday."

"TUCSON, Ariz. — Authorities are testing water from the San Pedro River in southern Arizona that may be contaminated with toxic waste that traveled north after a massive copper mine spill in Mexico this summer."

"Banamichi, Mexico - Liseth Mendez and Judas Barrios milk two cows covered in a cloud of tiny persistent flies as the sun taints in red the surrounding mountains near a ranch less than a kilometre from the Sonora River."

"Water pollution disasters in Mexico have turned into political battles as officials struggled Wednesday to blame each other for the problems."

"PALOMINAS, Ariz. -- The San Pedro River is idyllic on a mid-August morning, with tall cottonwood trees creating a shady respite from temperatures already into the high 80s and muddy banks pocked with animal tracks."

"Tropical storm Dolly lashed Mexico's northeast coast on Tuesday night, the U.S. National Hurricane Center (NHC) said, bringing torrential rain and life threatening flash floods."

"An oil pipeline spill that contaminated a river in the northern Mexican state of Nuevo Leon will take months to clean up, the country's top water authority said on Thursday."

"Mexico's environment secretary said on Tuesday that Grupo Mexico gave false information about a toxic spill at its Buenavista mine in northern Mexico, a day after the environmental authority said it would file a criminal complaint against the company."

"A civil defense official says that about 10 million gallons of mining acid leaked into a river that supplies water to tens of thousands of people."

"MEXICO CITY — Mexico’s Congress approved on Tuesday a sweeping overhaul of the energy industry that cleared the way for international giants to tap Mexico’s rich reserves of oil and gas."