Hard Work (IMAGE) Columbia Climate School Caption Farmworkers in northern Mexico harvest lettuce. Heat mortality among young adults across the nation is high, probably in part because they are the ones most apt to do manual labor. Credit Charles O’Rear/U.S. National Archives Usage Restrictions No restrictions. License Public Domain 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.