Sources and sinks
The term carbon source refers to any process or activity that releases a greenhouse gas, an aerosol or a precursor of a greenhouse gas into the atmosphere.
The term carbon sink is referred to as any process, activity or mechanism which removes a greenhouse gas, an aerosol or a precursor of a greenhouse gas from the atmosphere. The soil, vegetation or the ocean are carbon sinks.
This article, "The Morrison government wants to suck carbon dioxide out of the atmosphere. Here are 7 ways to do it" describes technologies to remove carbon dioxide from the atmosphere.
(Figure source: Anders Classens)