Are you arguing against the existence of an objective reality? Seems a little extreme. There are countless facts, indisputably so. Gravity, death, the fact you wrote me an answer, the fact I'm writing you an answer. These aren't opinions

> Is climate change man-made?

When having the climate change conversation with deniers I roll it back to; is the climate warming? They almost always[0] agree it is and we agree it’s evidenced. So now we’ve agreed on a fact and have common ground to advance the conversation. Then I can make my case that if we know the climate is warming then we have a responsibility/necessity to reduce our contribution to it and should likely invest in finding ways to reverse it. Because even if we are not the cause, we have a lot at stake.

[0] in rare case they can’t agree to this, I usually ask them if they’ve encountered a source for that and then ultimately implore them to at least read something on the topic before forming their opinion about it, there’s plenty of data available I won’t push them down any path that may be seen untrustworthy or politically misaligned with their beliefs, I just leave it alone there because it’s usually quite obvious they’re parroting the talking points of some pundit without doing any research themselves. As the article mentioned, this argument would just become an ego war more than anything.

It's too early in the morning for this much sophistry.

Do I need to hold the opinion that water is wet for it to be factual?

To answer your question, if by climate change you refer to the dramatic post-industrialisation acceleration of warming and climate disturbances, the correct answer is "the overwhelming majority of existing evidence points to yes".

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.

I made $xxx,xxx.00 last year, that is a fact, I can definitively prove it via deposits to my bank account. It is a fact.

Climate change being man-made or not definitely does not fall into “this is a fact”