How we Calculate Emissions

Overview

CarbonBuddy calculates emissions using calculation tools and resources provided by the Greenhouse Gas Protocol (GHGP) as well as tools and resources of the United States Environmental Protection Agency (EPA). In addition, CarbonBuddy is constantly seeking new input from peer review studies (i. e. this one on diet) focusing on emission measurement to refine the calculations provided to you. Please continue reading for a more detailed description on how we calculate emissions.

 

With our calculators, we aim to provide tools that give you the option to determine an estimation of your emissions.  Furthermore, we aim to find a balance between accuracy and user friendliness to give everyone the option to calculate and offset because the more we reach, the faster we can transition towards 100% renewable's.  If you have comments or questions on our calculators, please write us at: emission.calculator@carbonbuddy.com

These are our Calculation & Offset Tools

Hawai'i specific



App & International Calculators


Air-travel related emissions

International air travel emissions (Air-travel Emission Calculator & Global Citizen & Global Small Business Emission Calculator)

Emissions are calculated based on the duration of flights. Flight emissions for available categories and classes are based on a flight from DEN-SFO (short-haul) and SYD-HNL (long-haul). Distances between airports are measured using the Google Earth Pro software. Distances (passenger miles) are used to calculate emissions using GHGP Mobile Combustion Tool V2.6. Emissions of the sample trips are then divided by flight duration in hours to obtain emissions per hour of flight time.

 

Inter-Island travel emissions (Hawai'i calculators only)

Distances between airports are measured using the Google Earth Pro software. Distances (passenger miles) are used to calculate emissions using GHGP Mobile Combustion Tool V2.6. The calculation represents an average between different flight classes and are not airplane specific.

 

The following airports are used to determine Inter-Island emissions:

 

·         Kauai (LIH), Oahu (HNL), Molokai (MKK), Lanai (LNY), Maui (OGG), Hawaii Island (KOA)

In case you are not asked about your detailed travel habits (because you selected a quick and simple calculation) the average of all possible flights between the six Island is applied to calculate emissions.

 

Out-of-State travel emissions (Hawai'i calculators only)

Distances between airports are measured using the Google Earth Pro software. Distances (passenger miles) are used to calculate emissions using GHGP Mobile Combustion Tool V2.6. The calculation represents an average between different flight classes and are not airplane specific.

 

The following airports and flight routes are used within detailed calculations:

 

·         US west coast (SFO-HNL), US central States (DEN-HNL), US east coast (JFK-HNL), Canada (YYZ-HNL), Japan (HND-HNL), Oceania (SYD-HNL), Korea (IIA-HNL), China (PEK-HNL), Taiwan (TPE-HNL), Europe (FRA-DEN-HNL), South-east Asia (CGK-HNL), Hong-Kong (HKG-HNL), Central America (MEX-HNL), South America (RIO-DFW-HNL), South Africa (JNB-JFK-HNL), Northern Africa/Middle East (TLV-JFK-HNL), Other Asian Countries (IGA-HNL)

 

Within the short calculation versions, the following routes are applied to applied to calculate emissions:

 

·         US west coast (SFO-HNL), US central States/Canada (DEN-HNL), US east coast/Central America (JFK-HNL), Europe (FRA-DEN-HNL), Africa (JNB-JFK-HNL), South America (RIO-DFW-HNL), Japan (HND-HNL), Oceania/South Pacific (SYD-HNL), Asia (PEK-HNL)

 

Vehicle related emissions

Applies to all calculators

Vehicle emissions for gasoline, diesel and biodiesel vehicles are calculated on Emission data from the EPA Center of Corporate Climate Leadership. Emissions for electric vehicles are based on emissions produced by electricity consumption (for Hawai'i specific calculators). For more information on emissions from electricity consumption, please see the energy section below.

 

The following fuel consumption rates are assumed within the Hawaii Tourist Calculator: Green Traveler (or similar) MPG45, Compact MPG35, Mid Size MPG27, Full Size MPG22, SUV/Minivan MPG17. In addition, these distances are assumed to be traveled daily: Kaua'i 30miles, O'ahu 30miles, Moloka'i 20miles, Lana'i 20miles, Maui 35miles and Hawai'i Island 50miles.

 

The following assumptions are applied for ground transportation emission calculations within the Hawai'i Event Emission Calculator:

Vehicle efficiency: 35 MPG; Distances per guest (both ways for events) or per day of visit: Kaua'i 30 miles, O'ahu 30 miles, Moloka'i 20 miles, Lana'i 20 miles, Maui 35 miles, Hawai'i Island 50 miles.

Accommodation related emissions

Hawai'i Event Emission Calculators

Accommodation related emissions are calculated using the International Tourism Partnership (ITP) Hotel Footprinting Tool V1.0, adapted to the calculators.

Energy use related emissions

Hawai'i calculators

Emissions from electricity generation and other energy sources (i.e. Propane, LPG, ...) as found in the calculators are obtained from the EPA eGRID2012 as displayed in this table from the EPA Center of Corporate Climate Leadership. Within the Hawai'i Resident Emission Calculator is an option to offset emissions with "one click". Amount of average per captia emissions for this offset option were obtained from the US Ennergy Information Administration here. The number for each Hawai'i resident was calculated by dividing the State's entire emissions (Table 1) by the number of capita (1,427,538) (US Census).

 

Global Citizen and Small Business Emission Calculator

Emissions from electricity are obtained from the World Bank (CO2 emissions per capita) which are further divided by the share of emissions generated from buildings. The amount of emissions depends on the time period of the calculation.

 

Diet related emissions

Hawai'i calculators

Diet related emissions for Hawai'i specific calculators were obtained from "Shrink that Footprint (http://shrinkthatfootprint.com/food-carbon-footprint-diet).

Global Citizen and Small Business Emission Calculator

Diet related emissions for US and Canadian residents were obtained from "Shrink that Footprint (http://shrinkthatfootprint.com/food-carbon-footprint-diet). For European country residents, emission numbers were obtained from this study: https://www.sciencedirect.com/science/article/pii/S2211912418300361?via%3Dihub#f0005. For all other countries available in the calculator, the average emission values from the same study were applied.

Emission comparison

We provide you with the service to compare your emissions to others to see where you stand in a larger context. The numbers displayed are obtained from the World Bank and can be found here.


CarbonBuddy is a Kuleana Green Business Member at the Kona-Kohala Chamber of Commerce and actively involved in the Sustainability Committee