Climate Central: The cows weren't acting like cows. In the remote reaches of Mexico's Copper Canyon, miles from the nearest road or settlement, a moving speck on a steep rock wall caught Alfredo Gonzalez's eye. "I thought, that couldn't be a cow, maybe a goat,' the longtime ranch manager and animal scientist. "The canyon goes straight up and down. But when we looked with binoculars, there they were: Criollos walking on the canyon walls.' Bingo. Criollos. Gonzalez and a former colleague from the Jornada Experimental...