In the fight against climate change, much of the conversation revolves around reducing greenhouse gases like carbon dioxide or methane - and attempting to raise oxygen levels. But there's another gas - hydrogen - that could play a big role in the fight for the climate. Marco Alvera, CEO of Italian energy infrastructure company Snam and author of the book, 'The Hydrogen Revolution,' joined Cheddar Climate to explain the role hydrogen plays in helping achieve a net-zero future.