Average temperatures in Hungary have risen by more than 1°C and in Budapest by more than 1.5°C since 1901, according to a study on climate change released by the Central Statistical Office (KSH). The study attributed Budapest’s higher average temperature rise to the so-called urban heat island (UHI) effect. The main cause of the UHI effect is that man-made surfaces absorb more heat than natural ones. Economic activities also contribute to it, the study added. According to the data, the average surface temperature in Europe last year was 2.1°C higher than the average temperature in the second half of the 19th century.