There is overwhelming consensus that the current rate of climate change, which by the way is totally unprecedented in history, can be from no other source than anthropogenic CO2. You can read the research and see how thoroughly and completely every possible confounding variable was accounted for.
The scientists who claim "current changes are, like all past changes, caused by other factors than the man-made" are not taken seriously by the mainstream, form an unimaginably slim minority and frankly are dangerously wrong.