The Cambridge Bitcoin Electricity Consumption Index (CBECI) estimates that by mid-September 2022 (September 21, 2022), about 199.65 MtCO2e (equivalent to 1 million tons of carbon dioxide) can be attributed to the Bitcoin network since its inception.
It should be noted that about 92% of emissions occurred after 2018. While emissions have risen sharply in recent years, things are different today.
Currently, we estimate annualized GHG emissions of 48.35 MtCO2e (as of September 21, 2022), which is 14.1% lower than the estimated GHG emissions for the same period in 2021 (56.29 MtCO2e), looking objectively at the best guess estimate, 48.35 MtCO2e accounts for about 0.10% of global greenhouse gas emissions, comparable to the emissions of countries such as Nepal (48.37 MtCO2e) and the Central African Republic (46.58 MtCO2e), and about half that of gold mining (100.4 MtCO2e).
More detailed information on Bitcoin emissions compared to other industries, activities and countries can be found on the CBECI website.