By what percentage is the maize crop in Souther Africa going to decrease by 2030 ?
Increasingly , ethanol is being used at low concentrations ( 10 % or less ) as an additive in gasoline ( gasohol ) for motor fuels to increase the octane rating , lower pollutants , and reduce petroleum use ( what is nowadays also known as " biofuels " and has been generating an intense debate regarding the human beings ' necessity of new sources of energy , on the one hand , and the need to maintain , in regions such as Latin America , the food habits and culture which has been the essence of civilizations such as the one originated in Mesoamerica ; the entry , January 2008 , of maize among the commercial agreements of NAFTA has increased this debate , considering the bad labor conditions of workers in the fields , and mainly the fact that NAFTA " opened the doors to the import of maize from the United States , where the farmers who grow it receive multimillion dollar subsidies and other government supports .