June 20, 2025Comment 0 « Back to Glossary Index Gases released into the air, often from burning fuels. Related Articles: What is Hydrogen and How is it Produced?Byproduct HydrogenBlendingCarbon Capture and Storage (CCS)Carbon Footprint« Back to Glossary Index Energy Density Efficiency Related Posts Hydrogen Refuelling Station Posted on July 28, 2025 Anaerobic Digestion Posted on June 4, 2025 What are The Different Types of Hydrogen Posted on March 17, 2025