1999 UNAM strike council of the university, which includes faculty and students, modified the proposal to make the tuition increase voluntary. Barnés declared that the conscience of each student would dictate who would pay increased tuition and who would not. Strikers grew increasingly belligerent and had violent altercations with students who were still attempting to enter the campus to try to resume classes. Meanwhile, UNAM issued multiple warrants against strikers who were accused of stealing computers, vehicles and earthquake monitoring equipment. The strikers took advantage of the situation to resist additional graduation requirements such as tougher examinations and time limits for graduation. When
Enrique Leff etc. Enrique Leff Enrique Leff (born Mexico, 1946) is a Mexican economist, who defines himself today as an environmental sociologist and environmentalist. He has written 25 books and 180 articles on political ecology, environmental sociology, environmental economics, environmental epistemology and environmental education. He is regarded as one of the key environmental thinkers in Latin America. After a degree in chemical engineering from UNAM (Universidad Nacional Autónoma de México) in 1968. Leff graduated with a Doctorat de Troisième Cycle in development economics from the École Pratique des Hautes Études, Paris, in 1975. Leff lectured at UNAM (Universidad Nacional Autónoma de México)