In the beginning, the consensus view was that human activity was not a significant factor in climate change. The consensus came about because of overwhelming evidence. In this matter, the causal relationship is the opposite of what you state, and you are making a false claim about how science works because you refuse to accept the evidence.
In the beginning the consensus view was that we were heading for an imminent "ice age" and then that view changes to "hockey stick global warming" and now to cover all bets, climate change.
I have questions that I have posed to climate scientists and if a reasonable answer comes back then anthropogenic climate change is on the cards. But in fifteen years, nary an answer to those questions have come back, so, any prognostications by climate scientists based on their models are, as far as I am concerned, worthless.
As far as the evidence is concerned, it may or may not support an anthropogenic causal regime. But, on the basis of that evidence, I lean towards a non-anthropogenic majority cause for climate change.
As far as how science works, climate scientists make many assumptions about their proxies that have not been verified as being conclusively accurate. There is sufficient evidence, if you actually look around for it, to say that the interpretation of the proxy evidence is either incomplete or wrong or meaningless.
