A Florida-based rail company is using new technology to reduce the intensity of greenhouse gas emissions from its fleet of trains. Using technology that automatically starts and stops trains, the CSX company plans to significantly improve fuel efficiency and reduce nitrogen oxide emissions. The upgrades might shrink the carbon footprint of each CSX locomotive by more than 200 tons annually. Mikhail Chester, a Fulton Schools associate professor of civil, environmental and sustainable engineering, says CSX is taking some helpful steps. But he explains that reducing emissions intensity is not the same as cutting overall carbon emissions, which would have more of a productive environmental impact as part of efforts to reverse detrimental climate change trends being exacerbated by carbon emissions.