The study looked at how different types of biochar affect the production of greenhouse gases in soil. They tested 16 biochars made from various materials like wood chips and turkey manure. The results showed that some biochars increased CO2 levels in soil, while others decreased it. Most biochars reduced methane and nitrous oxide production. Overall, the impact of biochar on greenhouse gas production depends on the type of biochar and the soil it's used in.