Fat hurts wrote:
All scientific discoveries build upon scientific consensus. That's the way science works.
Einstein could never have conceived his theories if there were no consensus on the properties of matter, light, natural processes, etc. In fact, Einstein did not actually throw away the scientific consensus on Newtonian physics. Rather, he was able to see Newton's work in a different way and improve our understanding of physical relationships and the nature of time.
And because of scientific consensus, we still study Newtonian physics and acknowledge that its principles still hold in most ordinary circumstances. Otherwise, our bridges would fall down.
For climate change, the scientific consensus is that current global warming is caused primarily by man-made emission of greenhouse gasses. If we do not drastically cut emissions in the next ten years then we are sentencing our children and grandchildren to conditions that will be increasingly unlivable. There is even a statistically significant chance that mankind could be extinct by the end of this century.
This is conflating so many different ideas that it's hard to know where to start and it's not very clear what your point is.
2+2 doesn't equal 4 because everyone at the Committee for Rules of Addition voted yea. Science does not equal consensus and the whole idea of "scientific consensus" is basically a buzzword used by people who want to promote an agenda (usually a political one). Furthermore, consensus for a lot of things change over time.
Consensus is reached by replication and reproducible results, scholarly debate, and peer review. You're basically putting the cart before the horse and appeal to consensus is (ironically) very anti-science.