The Ekos Carbon Footprint Lifestyle Calculator sources emission factors from the New Zealand Ministry for the Environment Guidelines for Voluntary GHG Reporting 2016.

Carbon Lifestyle footprints are an estimate only, as they are based on generalised consumption data rather actual measurement. Those who would prefer to measure actual emissions can contact Ekos for a quote on this service.

Consumption data and methodology is based on:

Flying

International Longhaul: Auckland - LA return

International Shorthaul: Auckland - Melbourne return

Domestic: Welington - Auckland return

Radiative forcing refers to the non-CO2e impacts of aviation emissions on global warming (e.g. NOx, water vapour, contrails) (impacts in addition to the CO2e gases). Accounting for radiative forcing is a more conservative approach to calculating aviation emissions footprints, compared with when RF is excluded.

Radiative forcing is a multiplier used to account for non-CO2 climate change effects of aviation (including water vapour, contrails, and NOx). A multiplier of 1.89 has been recommended by the European Assessment of Transport Impacts on Climate Change and Ozone Depletion (ATTICA). DEFRA point out, however, that the multiplier of 1.89 remains subject to uncertainty. For this reason, Ekos makes accounting for RF optional for our clients.

Driving

Consumption data from the New Zealand Ministry of Transport

https://www.transport.govt.nz/assets/Uploads/Research/Documents/Drivers-2014-y911-Final-v3.pdf

Electricity

Consumption data from the New Zealand Ministry for Business, Innovation and Employment

https://www.mbie.govt.nz/info-services/sectors-industries/energy/energy-data-modelling/statistics/prices/electricity-prices/sales-based-residential-prices.pdf

Individuals per household is 2.3 based on New Zealand Census data

http://archive.stats.govt.nz/Census/2013-census/profile-and-summary-reports/qstats-families-households/households.aspx

Gas:

Consumption data based on Ekos household survey

Waste

Consumption data based on Ekos household survey

Diet

Emissions data sourced from Shrink that Footprint

http://shrinkthatfootprint.com/food-carbon-footprint-diet

If you have a more up to date source of data we would love to hear about it. Get in touch.