By Stefanie Eschenbacher PROCESADOR DE GAS CACTUS, Mexico (Reuters) – It never gets completely dark in Colonia El Carmen, home to Mexico’s largest natural gas processing center, in the poor southern state of Chiapas. After sunset, a red glare emanates from flares dotted around the Cactus gas processing center, run by state oil company Petroleos Mexicanos (Pemex). The complex is unable to process the vast volume of gas emitted as a byproduct of oil production and disposes of the excess by flaring it, a widespread industry practice that scientists said is detrimental to the environment. Burning …