The profile converts the calculated CO2 tonnes to human breaths and balloons to make it mean something. I agree you need to compare it with something, but suggest that something larger than a balloon would be more useful. Greenhouse? Typical living room? Typical semi-detached house?

I think you should definitely compare with the current UK average. The ClimateCare site has figures: don’t know how up to date they are. The Defra calculator may have better ones.

Derek Smith