This description is for a program that encourages individuals and businesses to support carbon offsetting programs. Carbon offsetting programs are designed to reduce the amount of carbon dioxide released into the atmosphere by reducing emissions or increasing carbon sinks. These programs can be implemented through a variety of methods, such as planting trees
From Wikipedia
A carbon credit is a tradable instrument (typically a virtual certificate) that conveys a claim to have avoided greenhouse gas (GHG) emissions or to have enhanced removal of GHG from the atmosphere. One carbon credit represents the avoided or enhanced removal of one metric ton of carbon dioxide or its carbon dioxide-equivalent (CO2e).