carbon footprint

pops

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I have just tried to calculate this on two different websites (change.ie and carbonfootprint.com) with totally differing results. I don't understand how they can be so different. Very annoying.
 
How about... (highlighting is mine):

www.change.ie FAQ:
How accurate will the Calculator be?

If you have home energy bills and car mileage to hand, then it will be possible for the Calculator to give you an accurate profile. But we also want you to be able to use the Calculator with just the information you hold in your head. Naturally the result will be approximate and based on averages. The Calculator is not designed to give you an official reading of the energy rating of your home (this can only be done by a qualified assessor); rather it's a simple tool to help increase your understanding of climate change and your impact on it.

Who is producing the change.ie Calculator?

Agency.com, CawleyNea/TBWA, Mary Murphy PR and RPS Project communications are developing this website and the calculator on behalf of the Department of the Environment, Heritage and Local Government. Together with the AMEE (The World’s Energy Meter), a common database for carbon footprint measuring and profiling, we have developed the change.ie carbon calculator.

We are also working closely with other government departments and organisations, such as the EPA, SEI, Met Eireann, Department of Agriculture, Department of Transport and Teagasc, under a Scientific and Technical Advisory Group to ensure that the underlying data and conversion factors are robust and agreed across government and constantly updated as data become available.
and



www.carbonfootprint.com
Sources of our calculations
The calculations for the primary emissions are based on a combination of metrics from the UK's Department for Environment, Food and Rural Affairs (DEFRA), the UK's Department for Transport, and the US Environmental Protection Agency (EPA).

The calculations for the secondary emissions are based on estimates developed by Carbon Footprint to illustrate the impact on the environment from your day-to-day activities. Your actual secondary footprint may in reality be either lower or greater than that estimated here.

The total carbon footprint of an individual is the sum of their primary and secondary emissions.

The average carbon footprint per individual for each country is sourced from the EPA.
So - it's just a rough estimate based on totally different data sources?
 
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