The data is not so much manipulated by the IPCC as it is cherry picked. They ignore or delete the data that doesn’t fit what they want, and keep what they do. They were caught red-handed doing it years ago and they haven’t stopped. It’s about as bad a science as you can get.
“It’s about as bad a science as you can get...
It’s NOT a Science as it apparently has no predictive powers to within 1% much less an Engineering predictive power of <10%.