Yes it's a scientific fact humans have been causing the current warming by burning fossil fuels since the industrial revoluton.

You can make skeptical arguments against this is you're willing to dismiss empirical data and methodology behind scientific facts. The people who do this aren't consistent and cherry pick which empirical data, models and methodologies to dismiss. It tends to align with some belief challenged by the science. Or their financial interests.

It's much harder to be a consistent skeptic, since empirical data is verifiable, and the scientific method works for all sorts of fields and technologies. But it could all be dream of a mental patient in a simulation god programmed while making a bet with the devil.