A carbon offset replaces one tonne of carbon dioxide or equivalent being released into the atmosphere. An offset project prevents, reduces, or removes greenhouse gas emissions from being released into the atmosphere. Some examples of offset projects include renewable energy, reforestation, and fire management.
CitySwitch business may purchase offsets for a portion of their emissions eg flights. For Australian offset projects, the Clean Energy Regulator Issues Australian Carbon Credit Units (ACCUs).
Other businesses will offset all of their emissions from year 1 of their journey and make a claim of being carbon neutral by Climate Active.
This blog from the Climate Council frames offsetting alongside emissions reduction.