We can now tell how much CO2 in the air is due to fossil fuel burning
https://www.newscientist.com/article/2317175-we-can-now-tell-how-much-co2-in-the-air-is-due-to-fossil-fuel-burning/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home