Mexico City Mayor Andres Manuel Lopez Obrador has come a long way in the last decade -- too far, some environmentalists would argue. O, brador. Photo: Gobierno del Distrito Federal. In February 1996, AMLO (as the Mexican press calls him) was arguably the country's most prominent environmentalist, organizing a string of high-profile protests in his native Tabasco, in southeastern Mexico. The protests were aimed at forcing Pemex, the country's state-owned oil monopoly, to clean up its act and prevent crude oil spills from wells in Tabasco's lush, tropical plains and offshore in the Gulf of Mexico, where most of the …