Personal Carbon Foot printing Exercise
Introduction
In order to measure me annual emissions and take initiatives to be more environmental friendly, I define the calculation on my personal boundary and took the calculation on the website: http://www.isa.org.usyd.edu.au/
According to the ISA carbon footprint calculator, my total annual emissions are 4.5t of CO2-e (see the detailed data attached behind the report).
To evaluate the reliability of the calculation, I did similar test carried out by other organizations and had some interesting finds. In the following pages I will discuss the methodology issues, analysis of emission sources, sources of uncertainty, probable improvement and initiatives to undertake in the future.
Carbon Footprint & Methodology
I took the footprint calculator on the website: http://www.isa.org.usyd.edu.au/, the calculated items are divided into 5 categories (food, housing, mobility, goods and services) and are measured in annual dollar amount. It is quiet easy for users to input estimated annual consumption of the measured items in dollars and calculate their personal annual emissions instead of evaluating their monthly or annual usage of each item in amount.

I think the calculating methodology is to correlate the dollar amount with average emissions generated from the item (average kg of CO2 per dollar) and multiply the annual consumption by the factor.
Discussion of Activities & Appropriate classification or sources of emissions
To classify one’s energy use into sources of emissions, I work out the following table:
Items Operational
Mobility-private car Scope 1
Mobility-aircraft, public traffic Scope 1
Housing-Natural gas Scope 1
Electricity Scope 2
Others (housing-rent, food, goods and services, etc.) Scope 3
Sources of Uncertainty
The first uncertainty is the reliable calculating method in Scope3 items: other