I’ll see your 97 percent, and raise you 3 percent

Roy W. Spencer, Ph. D.
But I think a more significant statistic — one that doesn’t rely on opinions, but on facts — is that 100% of climate scientists don’t know how much of the warming in the last 50-100 years is natural versus human-caused.
They dance around this issue with weasel words and qualitative language. Because they don’t know. They can say “most” warming is human caused…but how do they know that? They don’t.
You see, we have no idea how much natural climate variations figure into the climate change equation.
For example, this proxy reconstruction of past temperatures suggests climate change is the rule, not the exception: