Temperatures are adjusted every year, in such way that decrease old temperatures and rises recent ones, to show some warming.
The explanation, I found, is that the data are taken mostly by volunteers who are going more sloppy every year!
That is, really, the explanation for the adjustments!
Unbelievable!
“The Case for Skepticism on Global Warming”
On January 25, 2005, at the National Press Club in Washington, D.C., towering writer, and himself a scientist, Michael Crichton delivered a detailed explanation of why he criticized the consensus view on global warming.
Using published UN data, he argued that claims for catastrophic warming arouse doubt; that reducing CO2 is vastly more difficult than is commonly presumed.
Crichton, a doctor (who does not practice medicine) spoke on why societies are morally unjustified in spending vast sums on a speculative issue when people around the world are dying of starvation and disease.