Metal hydrides are essential intermediates for many important processes in alternative energy production such as hydrogen (H2) production or H2 oxidation, electrochemical reduction of carbon dioxide (CO2) to carbon based fuels, and the hydrogenation of CO2 and carbon monoxide.  These processes are the future of the alternative energy landscape and necessary developments to combat global climate change.  Development of catalysts that can be better tuned particular chemical reactions will increase the efficiency and success of the chemical processes necessarily for alternative energy production. The review by Drs. Taheri and Berben in this issue discusses the efforts to prepare catalysts that selectively perform CO2 reduction rather than favoring H2 production.  In their review, a selection of iron carbonyl cluster catalysts that vary in their ability to reduce CO2 or produce H2 based on their structure and hydricity are discussed (Taheri and Berben 2017).