Inter Press Service: For months now, yellowed pastures, cracked soil and dead livestock have been the landscape of what otherwise are the most productive farming areas of Argentina, Brazil, Paraguay and Uruguay. Scientists say it is so far impossible to determine if the drought is a manifestation of climate change processes. “Climate change cannot be characterised by one single event, but rather by a series over the long term,” University of Buenos Aires climatologist Vicente Barros, member of the …