Recently, the world’s second-largest cryptocurrency, ethereum, implemented a major network upgrade that reduced its energy consumption by 99.9%. But though energy usage has been one of the cryptocurrency industry’s biggest targets for critique, it’s not likely that bitcoin will follow suit. Instead, bitcoin miners are touting their use of renewables and their benefit to the electrical grid, as they try to green their image. Here’s how both networks are trying to become more sustainable. Chapters: 00:00 - Introduction 02:24 - How mining works 05:18 - Proof-of-stake 08:57 - Energy implications 14:10 - Future » Subscribe to CNBC: https://cnb.cx/SubscribeCNBC » Subscribe to CNBC TV: https://cnb.cx/SubscribeCNBCtelevision About CNBC: From 'Wall Street' to 'Main Street' to award winning original documentaries and Reality TV series, CNBC has you covered. Experience special sneak peeks of your favorite shows, exclusive video and more. Connect with CNBC News Online Get the latest news: https://www.cnbc.com/ Follow CNBC on LinkedIn: https://cnb.cx/LinkedInCNBC Follow CNBC News on Facebook: https://cnb.cx/LikeCNBC Follow CNBC News on Twitter: https://cnb.cx/FollowCNBC Follow CNBC News on Instagram: https://cnb.cx/InstagramCNBC #CNBC Mining Crypto Uses A Massive Amount Of Energy — Why That Could Be Changing