If you ask most people what they think of blockchain applications or cryptocurrency, the response is usually a blank stare of utter bafflement. Well, this week on Sea Change Radio, we are going to try to make some sense of this arcane concept as we re-visit our 2018 discussion with Paul Gambill, an entrepreneur who has devised a carbon dioxide removal marketplace which incorporates blockchain applications. Gambill explains how his startup, Nori, uses this cryptography-based technology, how it plans to ramp up into a vibrant marketplace of buyers and sellers, and why he believes this could actually help reverse the effects of climate change. Then, we speak to Jackie Francis, the executive director of the Keeling Curve Prize as she tells us about her organization's mission and gives us a glimpse at some of the 2019 winners.