Quote Originally Posted by BushMasterBoy View Post
Only offset I can think of is to plant trees.
This makes sense...... You just have to ensure that where you plant those trees, there will in perpetuity always then be trees. If those trees burn then it is a wash in the carbon cycle. If those trees die and turn into soil organic matter that gets respired back into the atmosphere, its a wash. I guess you could plant the trees, chop them down and burry them in an anoxic lake where their carbon uptake will never be undone. Additionality is a real bitch with this one. When you get down to it, the biosphere is only a reservoir for carbon and unless you increase that reservoir and keep it increased forever it doesn’t really act as a sink.

If you sell carbon credits to plant a forest and then that forest dies or burns, all the carbon that it up took just goes back to the atmosphere.

There are parts of the ocean system where your photosynthetic plankton will fall into the deep ocean (carbon reservoir of roughly 1e5 years). There are interesting proposals to fertilize those areas and sink carbon to the deep ocean that way. Though the carbon cost of deployment is also often thought of as being greater than the sink....