carbon offsettingnoun [ U ]
ukusENVIRONMENT, SOCIAL RESPONSIBILITY the process of trying to reduce the damage caused by releasing carbon dioxide into the environment by doing other things that remove carbon dioxide, for example, by planting trees:
The practice of carbon offsetting - paying a third party to remove or otherwise offset an amount of carbon equivalent to the volume emitted - is now falling under close scrutiny.
If you are going to use air travel, you might at least consider carbon offsetting schemes.