You say that natural variation has not stopped but it had zero contribution.
You realize that you are proposing that natural variation is in fact zero variation under that scenario.
How did all those changes happen over history with zero natural variation?
Clearly there has always been a level of natural variation over history. How much of that .7 of a degree was natural variation? If science cant determine that, how can it determine how much of the cahnge is something other than natural variation.
To say that natural variation just fell away to zero in the last 100 years is unbelievable. Why would it suddenly do that for the first time in all of history?
