tree felling graph (IMAGE) Penn State Caption his graphic from the study shows tree-felling fatalities by year and industry segment (2020 data includes only first half of the year). Credit Penn State Usage Restrictions non commercial use only License Original 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.