https://www.scientificamerican.com/article/three-quarters-of-climate/
Natural climate variability is extremely unlikely to have contributed more than about one-quarter of the temperature rise observed in the past 60 years, reports a pair of Swiss climate modelers in a paper published online December 4. Most of the observed warming—at least 74 percent—is almost certainly due to human activity, they write in Nature Geoscience.
Believe me. The guys that conducted this study are much smarter than anyone on this board. Smarter than I.