Yesterday we launched The Green Gas Book.- a series of essays exploring the development of “green gas” (or more accurately, “green gases”), written by experts in the field. This book looks at the range of those green gases – biomethane, hydrogen, bio-substitute natural gas (bioSNG) and biopropane – their uses, benefits and potential challenges in their application. While no one of these green gases is the perfect solution, we may think of them as “10% solutions,” which, together with developments such as district heating schemes, would go a long way towards helping us decarbonise the heat sector. This book was commissioned by Labour’s frontbench energy team and has been produced in co-ordination with the PLP’s energy and climate change committee. We hope that it can serve as an important contribution to policy discussion.