I expect you meant "it is something strictly between 100% and 0% and not particularly close to either one"

Yes, I do.

On what basis do you make that claim?

Earth has been warming up for a while (in terms of centuries) by now -- we're still coming out of the last Little Ice Age. On a more short-term scale for when we have direct instrumental data, I believe (from memory) that the current warming trend started around 1850 which is too early for CO2 to make a noticeable impact. And, of course, the graph of the global temperatures and the graph of the CO2 concentration in the atmosphere do not match too well.

The short answer is that it's complicated and the temperature trends do not look like they're driven solely by the very evenly increasing CO2 concentration. As to not being 0%, well, physics.

That doesn't answer the question, though.

Not directly, no, but it does imply that the answer will be different for different groups of people.