UTM_Glue_Clover Lab (IMAGE) University of Toronto Caption (From left) University of Toronto Mississauga biology professors Rob Ness and Marc Johnson, and UTM PhD student James Santangelo collaborated with more than 280 researchers worldwide to collect and analyze clover plants in cities around the world. The study provided the clearest evidence yet that humans are affecting evolution on Earth. Credit Photo by Nick Iwanyshyn Usage Restrictions No sales. No archives. For use only in coverage of this report. 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.