This Practice Note provides practical guidance on decarbonisation for businesses and will be of interest to practitioners (including inhouse and GCs) advising businesses on climate change. It begins by explaining climate change and the global need for net zero, providing definitions on some of the key terms in this area (net zero, absolute zero, zero carbon, climate neutral, carbon neutral, net negative, Paris-aligned, science-based) and also provides details on the business need to decarbonise, covering opportunities and risks. It then provides practical steps on how to assess a business’ carbon footprint, including emission scopes (1–4) and how to set a greenhouse gas (GHG) target and a carbon management plan. It also covers offsets, barriers to net zero and provides some case studies of corporate carbon reduction strategies.