Diarmid is author of over 100 journal papers, reports, and book chapters, a lead author on three Intergovernmental Panel on Climate Change (IPCC) reports, and of the first health report to the UN Climate Negotiations. A keen cyclist, he rode from Geneva to Paris for WHO’s 2nd Global Conference on Health and Climate Change in 2016, and in 2021 - from Geneva to London to hand over the “COP26 Special Report – The Health Argument for Climate Action” to a group of pediatricians cycling to Glasgow.