What was done
The authors analyzed various characteristics of climate in Bulgaria during the 20th century by applying Meteo-France homogenization procedures to many raw data sets of the country, which procedures included, in their words, "control of monthly data of precipitation and average air temperature from selected weather stations in Bulgaria; detection of breaks and outliers within the collected and controlled time series; correction of the climate long-term series according to the defined breaks and outliers in order to obtain homogenized climate series."

What was learned
Alexandrov et al. report "there was no significant warming trend during the last century in Bulgaria in spite of the slight increase of average air temperature during the last two decades."  They also note that "a decreasing trend in annual and especially summer precipitation from the end of the 1970s was found," and that "variations of annual precipitation in Bulgaria showed an overall decrease."

What it means
It seems quite amazing that, over the period of time climate-alarmists claim the earth experienced a warming that was unprecedented over the past one to two millennia, there would not have been at least some degree of warming in Bulgaria.  The concurrent decline in that country's precipitation also flies in the face of climate-alarmist contentions, as does its decreasing variability.  These three strikes against their position clearly indicates that the climate of Bulgaria is not a "team player" when it comes to towing the IPCC party line on CO2-induced climate change.

Especially enlightening in this regard is the authors statement about precipitation.  They note that "according to [the] IPCC annual precipitation trends in [the] 20th century are characterized essentially by enhanced precipitation in the northern half of Europe, with increases ranging from 10% to close to 50%," but they report that according to real-world data, "the region stretching from the Mediterranean through central Europe into European Russia and Ukraine, by contrast, has experienced decreases in precipitation by as much as 20% in some areas."  Thus, another part of the planet once again fails, and fails miserably, to conform to the contentions of the world's climate alarmists.