The website

This website was launched in 2007 to give unbiased information on climate change, carbon dioxide and other greenhouse gas emissions, and how to become independent of fossil fuels. The calculator is constructed according to the best information available, and will be updated as new information becomes available.

The stance of this website is that of a policy scientist. This means


The main author is Ian Campbell (iancampbell.co.uk).

  • 15 years working as a hospital doctor specialising in General Surgery and in Radiotherapy & Oncology (cancer treatment)
  • 14 years working as a statistical consultant on about 120 projects for about 60 clients.

  • BA (1975) medical sciences
  • MB MChir (1978) clinical medicine
  • FRCS (1982) Fellow of the Royal College of Surgeons
  • FRCR (1989) Fellow of the Royal College of Radiology (Radiotherapy and Oncology)
  • BSc (1994) Open University degree in statistics
  • MD (1994) doctorate in the use of statistical methods in cancer research

Competing interests: No financial interest in this area

Twitter: @Ian_Campbell_


Thanks are due to Margaret, Helen, Debbie, Peter, Carol, Geraldine, Clive, Andrew, Patrick, Ann, Gen and John for feedback on earlier versions of the calculator, and to many others for feedback on the calculator and information pages.

Contact us

Comments on any aspect of this website are welcome via

The aim is to give a fair summary of the evidence, and unbiased conclusions. Please give feedback about any errors, omissions, or unfair conclusions so that they can be corrected.


Copyright information

Images and tables from academic and government publications
Some images and tables from academic, government, and other publications have been reproduced on this website, and permission has been assumed on the basis that
  • the use is non-commercial
  • attribution has been given
  • the meaning has not been altered.

Charts by carbonindependent.org
Any chart produced by carbonindependent.org can be copied without restriction.

Flooded telephone box: The Flood! Catcliffe Fire Brigade rescuers: Copyright Mark Lomas www.flickr.com/photos/outallnight/
Dry river bed: Matt & Kim Rudge www.flickr.com/photos/mattandkim/94501076/in/datetaken/
Evidence of the severity of the drought in Kenya - this was marked on the map as a river.
Wind turbines: Stuart Yeates www.flickr.com/photos/stuartyeates/93821358/in/datetaken/
Boys biking, silhouette: Copyright Karl Hutchinson: www.flickr.com/photos/whateverthing/

First published Feb 2007
Last updated: 15 Apr 2023