In a nutshell, greenhouse gas (GHG) emissions are gases released by the burning of fossil fuels that trap heat in the atmosphere.
Since there are many different kinds of GHGs that are emitted, with carbon dioxide (CO2) being the most common, total emission volume is typically measured in units of CO2-equivalent (such as metric tons). Measurabl uses this unit when displaying emissions totals (screenshot below).
GHG emissions are typically divided into three categories called scopes:
- Scope 1 emissions are emissions from fuels that are burned onsite, such as natural gas or fuel oil
- Scope 2 emissions are emissions from fuels that are burned offsite to deliver energy to your building, mainly emissions from electricity use
- Scope 3 emissions are other emissions your organization generates indirectly, such as emissions from transportation, waste generation and disposal, and purchased products