Thomas Hertel, Purdue University (IMAGE) Purdue University Caption Purdue agricultural economist Thomas Hertel and fellow researchers say that an agricultural revolution in Africa could have strikingly different global impacts from the Green Revolutions of the past. Credit Purdue University / Tom Campbell Usage Restrictions Please give photo credit to Tom Campbell. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.