"Discharges of sewage, trash, and toxic sludge from Mexico have one California border city threatening to sue a binational agency charged with managing water pollution along the U.S.-Mexico border."

President Trump's efforts to upend the trade treaty known as NAFTA could jeopardize the U.S.-Mexico trade in natural gas -- on which the U.S. energy industry depends.

"The Mexican government, tycoon Carlos Slim and U.S. actor Leonardo DiCaprio on Wednesday unveiled a joint plan to protect a tiny porpoise in the Gulf of California that has become a potent symbol of critically endangered animal species."

"Mexico's government has enlisted the help of three trained dolphins to locate in the wild their less fortunate cousin, the rare vaquita porpoise, in an effort to bring back from the brink of extinction a species with fewer than 40 specimens left."

"As the White House pushes Congress to fund President Trump's U.S.-Mexico border wall, a new wrinkle has emerged that could stymie parts of the massive project. Mexican engineers believe construction of the border barrier may violate a 47-year-old treaty governing the shared waters of the Rio Grande. If Mexico protests, the fate of the wall could end up in an international court."

"A gang of dozens of fishermen overturned inspectors' trucks, burned or destroyed 15 vehicles and patrol boats, and beat three inspectors from the office for environmental protection in a town on Mexico's Gulf of California."

"More than 27 percent fewer monarch butterflies migrated to Mexican forests during the 2016/2017 season, a study showed on Thursday, fueling concerns the orange-and-black insect could face growing threats from weather and deforestation."

"A Mexican indigenous leader who was awarded the prestigious Goldman Environmental Prize in 2005 for his fight against illegal logging has been shot dead, less than a year after another winner of the award was slain in Honduras."

"U.S. Navy-trained dolphins and their handlers will participate in a last-ditch effort to catch, enclose and protect the last few dozen of Mexico's critically endangered vaquita porpoises to save them from extinction."