On this edition of Open Field, Eamon is joined by Vinay Gupta, an expert on blockchain, and whose career has covered many areas of work from computer programming and venture capital through to humanitarian relief planning.

Across this half-hour discussion, Eamon and Vinay cover the energy challenges of blockchain; the race to build the biggest computer; why we actually might want to make oil cheap again; whether political solutions to climate change can work; and how to revolutionise the United Nations.