They can't. They destroyed all the original data and only kept tainted stuff that they manipulated.
This ridiculous article states the argument against AGW is "superficially about the science." What hubris! They have no REAL scientific and verifiable facts and figures to back up AGW so they just attack using words without facts to back them up.
Boy, that is real scientific, Nature.com.
Absolutely correct. A politically driven theory. No science at all!!