In the Report you will see a reference to Confidence Levels in the results. This refers to how much confidence we have in the actual figures produced by the Calculator for each item, on a range from 1 to 3, where:
1 - lower confidence
3 - high confidence
This is because some items are inherently far more reliable and understood than others. For instance, diesel or electricity is high confidence - you know how much you've used and therefore the calculation for what the emissions are is quite mathematical.
Conversely emissions from compost, or sequestration in hedgerows are difficult to be accurate with because they are biological and therefore there are a lot of variables.
We therefore have the Confidence levels to give transparency. Please bear in mind however that every emissions/sequestration factor is backed up by firm science and we aim to provide the most accurate figures available.