Intended for healthcare professionals

Letters Call for emergency action to control global temperatures

UK’s share of the global carbon budget will be used up in 3.3 years

BMJ 2021; 374 doi: (Published 30 September 2021) Cite this as: BMJ 2021;374:n2391
  1. Ian R Campbell, medical statistician
  1. Wirral, UK
  1. ian{at}

How urgent is an “emergency?”1 After the 2019 street protests, many national and local administrations declared a climate emergency but have since failed to implement the “rapid and far reaching transitions” recommended by the Intergovernmental Panel on Climate Change (IPCC) 2018 report2 that sparked the protests.

The urgency of the climate emergency can be quantified by the carbon budget—how much more carbon dioxide (CO2 …

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