Short answer: Not Much At All

How Much Has the Earth Actually Warmed?

Maybe the only good thing about covid hysteria is that it has, for a while, drowned out global warming hysteria. Still, many people have the impression that global temperatures have warmed alarmingly in recent decades. Unfortunately, there is no reliable record of surface temperatures for a number o…

Power LineJohn Hinderaker

Key quote:

Unfortunately, there is no reliable record of surface temperatures for a number of reasons, including the fact that the activists who are in charge of the records keep changing them to promote the alarmist position.