More than two thirds (67 %) of greenhouse gas emissions that cause climate change came from cities in 2020. It is therefore not surprising that mayors have joined national politicians in setting emission reduction targets within their jurisdictions.  Many UK cities have committed to becoming net zero before governmental goal by 2050 (v Scotland it is the year 2045).  Manchester  aims to be net zero by 2038, Liverpool a Birmingham until 2030. Nottingham it expects to become the first carbon neutral city in the UK as early as 2028. ( Graeme Roy, University of Glasgow)