In this episode Vikram explains how our current economy runs on hydrocarbons (e.g., natural gas, oil, coal), which release carbon dioxide during combustion. In a "hydrogen economy," hydrogen replaces hydrocarbons and combustion release water vapor, not CO2. But is feasible or realistic? Vikram explains that not only is it technically realistic, elements of the hydrogen economy are well underway. Clean hydrogen production comes from water electrolysis using excess green electricity that is available when solar and wind energy produce more than electricity than the grid requires. The resulting hydrogen is already being used as an admixture  to natural gas, converted into ammonia or stored and burned for to produce electricity during low periods. Tune into the video to see his final assessment on how realistic the full hydrogen economy is. Vikram's latest book Particulates Matter: Impact, Measurement and Remediation of Airborne Pollutants, where he discusses emissions from energy production/use and means to ameliorate the environmental impact, is available here: https://www.elsevier.com/books/particulates-matter/rao/978-0-12-816904-9