East Anglia lost a lot of data, they say go look at NASA for the data, NASA isn't sharing the data
IPCC said Holland would be under 15 feet of water, oops they got that wrong. They said North African crops would die in 20 years, they got that wrong too; they said the Himalayas would be ice-free by 2035 and they got that wrong too. Funny how all these errors were aimed at the broadest political effect.
Any review or model or analysis that presumes there was radical global warming in the 20th century is using guesswork, because they can't demonstrate that there was or is such warming.