Also, it should be noted that earthworms add value with respect to soil fertility.
A collective study between different countries indicates earthworms are multiplying at a faster rate than ever.
Earthworms produce green house gasses. Bacteria and earthworms produce Nitrous oxide.
Check out this news story and decide for yourself where you stand on the role of earthworms.
For more information on this story, check out this article, “Greenhouse gas emissions from soils increased by earthworms: opening a can of worms” in the Carbon Brief Publication.