Soot and Tar Balls (image) Michigan Technological University Caption This field emission scanning electron microscopy image of tar balls with an aggregation of soot illustrates the variability of particles in biomass fires. Michigan Tech scientists say incorporating their various properties in models will improve climate change predictions. Credit Swarup China Usage Restrictions None 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.