I can't imagine why, except for the fact it blows a HUGE hole on a cherished talking point for their "scientific consensus" on "global warming" nonsense.
"Guess what. Almost all the socioeconomic variables were important. We found the data were of highest quality in North America and that they were very contaminated in Africa and South America. Overall, we found that the socioeconomic biases 'likely add up to a net warming bias at the global level that may explain as much as half the observed land-based warming trend.'"